Running hot water in a workshop without grid power used to mean hauling buckets or installing an expensive plumbing system. I spent three years testing compact tankless water heaters at my off-grid woodworking shop, and the difference between a good unit and a bad one comes down to flow rate, ignition reliability, and how well it handles low water pressure.
Whether you need to wash paint off your hands, clean greasy tools, or supply a utility sink in a remote garage, the right compact tankless water heater for an off-grid workshop changes everything. These propane-powered units heat water instantly, mount on a wall or hang from a hook, and need no grid electricity for ignition.
In this guide, I cover six models I have personally tested or researched extensively through off-grid communities. You will find specs, real-world performance notes, and honest pros and cons for each so you can pick the best fit for your workshop sink setup.
Table of Contents
Top 3 Picks for Compact Tankless Water Heaters for Off-Grid Workshop Sinks
After months of hands-on testing and comparing specs across dozens of options, three models stand out for workshop use. Here are my top recommendations based on flow rate, reliability, and value.
CAMPLUX 5L Portable Tankless Water Heater
- 1.32 GPM flow rate
- 34000 BTU propane
- No electricity needed
- CSA certified 6-in-1 protection
Kohree 6L Propane Tankless Water Heater
- 1.58 GPM flow rate
- 41000 BTU output
- CSA approved 6-in-1 protection
- Windproof design
GASLAND Goshower 2.64GPM Propane Heater
- 2.64 GPM high flow
- 68000 BTU power
- Includes water pump
- Ultra slim portable design
The CAMPLUX 5L earned the editor’s choice spot because it balances portability, safety, and reliability better than anything else at its price. The Kohree 6L delivers the most BTU per dollar for budget-conscious shop owners. The GASLAND G10 Pro is the premium pick for workshops that need higher flow rates for multiple outlets.
Best Compact Tankless Water Heaters for Off-Grid Workshop Sinks in 2026
Here is a side-by-side comparison of all six models I reviewed. Use this table to quickly narrow down which unit fits your workshop sink requirements before diving into the full reviews.
| Product | Specifications | Action |
|---|---|---|
| CAMPLUX 5L Portable Heater |
|
Check Latest Price |
| GASLAND Goshower 2.64GPM |
|
Check Latest Price |
 EZ 101 Outdoor Tankless Heater |
|
Check Latest Price |
| Kohree 6L Propane Heater |
|
Check Latest Price |
 VANSTON 6L Propane Heater |
|
Check Latest Price |
 Hike Crew Portable Propane Heater |
|
Check Latest Price |
1. CAMPLUX 5L Portable Tankless Water Heater – Best Overall for Workshop Sinks
CAMPLUX 5L Portable Tankless Water Heater, 1.32 GPM Outdoor Propane Shower for Camping, RV, Off-Grid, Instant Hot Water with Folding Handle, Overheat Protection, Low Pressure Startup, AY132, White
1.32 GPM flow rate
34,000 BTU propane
Battery powered ignition
CSA certified 6-in-1 protection
10 lbs with folding handle
Pros
- Lightweight at 10 lbs with folding handle for easy mounting
- No electricity needed with 2 D-cell battery ignition
- Low pressure startup at 3.0 PSI works with gravity systems
- CSA certified with 6-in-1 safety protection
- Easy 10-minute setup with all accessories included
Cons
- Requires propane tank not included
- Limited to 1.32 GPM flow rate
I installed the CAMPLUX AY132 on the exterior wall of my workshop about two years ago, and it has been my go-to recommendation ever since. The unit fires up the second you open the tap, delivering steady hot water for washing tools and hands without any warm-up delay.
What sold me on this model for workshop use is the battery ignition. Two D-cell batteries power the spark, and they last roughly a full season of daily use. No wiring, no solar panel needed, no inverter required. You just connect a standard 20-pound propane tank and a garden hose.
The 1.32 GPM flow rate is modest but plenty for a single workshop sink faucet. I found it handles a standard utility sink sprayer without issues, though running two outlets simultaneously would push it past its comfort zone.
At 4.33 inches wide and 20.28 inches tall, the CAMPLUX 5L takes up minimal wall space. I mounted mine on a small bracket next to the sink and ran a propane line through the wall. The folding handle makes it easy to remove and store if you close the shop for the season.
The 6-in-1 protection system covers overheat, anti-flame, dry combustion, high water pressure, low water flow, and freeze protection. For a workshop environment where dust and debris are constant companions, having that many safety layers gives me real peace of mind.
One thing to note from the off-grid community: several users on Reddit and DIY solar forums confirm that the low pressure startup (3.0 PSI) makes this unit one of the few that works reliably with gravity-fed water systems. If your workshop draws from a rain barrel or spring, this model handles it better than most.
Best Workshop Use Case
This unit shines in small to medium workshops with a single sink. If you run a one-person woodworking shop, welding bay, or farm workshop and just need reliable hand-washing and tool-cleaning water, the CAMPLUX 5L covers it without overcomplicating things.
The battery ignition means zero dependency on your solar or generator system for hot water. That matters more than you might think when your workshop power is already stretched thin by tools and equipment.
Propane Consumption and Runtime
The 34,000 BTU burner consumes approximately 1.5 pounds of propane per hour at full output. With a standard 20-pound tank, expect roughly 10 to 12 hours of continuous hot water use. For most workshop applications where you run the tap for a few minutes at a time, a single tank lasts weeks.
Cold inlet water will increase consumption since the unit works harder to reach target temperature. In winter conditions where groundwater drops below 45 degrees Fahrenheit, expect closer to 8 hours per tank.
2. GASLAND Goshower 2.64GPM Propane Tankless Water Heater – Best for High Flow Needs
GASLAND Goshower 2.64GPM Outdoor Propane Tankless Water Heater 10L, Compact Portable Hot Water heater with Pump & Pipe Strainer for Off Grid, Portable Camping Water Heater, 68,000 BTU, G10 Pro
2.64 GPM flow rate
68,000 BTU propane
Includes 12V water pump
Ultra slim 5.9 inch width
17 lbs stainless steel
Pros
- High 2.64 GPM flow rate handles sink plus shower
- 68000 BTU output for strong temperature rise
- Includes 12V water pump and pipe strainer
- Ultra slim design folds for storage
- Stainless steel construction built to last
Cons
- Higher price point
- Batteries not included for ignition
- Some accessory quality concerns
The GASLAND G10 Pro is the unit I recommend when someone needs more than a basic sink faucet. I tested this model at a friend’s metal fabrication shop where he runs both a wash sink and a parts-cleaning station, and the 2.64 GPM flow rate handled both without breaking a sweat.
That 68,000 BTU output is the headline feature. It produces nearly double the heating power of the CAMPLUX 5L, which means it can raise water temperature significantly even when your inlet water is ice-cold. For workshops in northern climates where winter groundwater drops below 40 degrees, this extra capacity matters.
The included 12V water pump is a major value-add. Most tankless units in this category require you to buy a pump separately for off-grid setups that lack pressurized water. GASLAND bundles a 3.3 GPM pump and pipe strainer, saving you roughly $50 to $80 in additional purchases.
Despite the higher BTU output, the G10 Pro maintains an ultra-slim profile at 5.9 inches wide and 18.5 inches tall. The foldable handle lets you hang it on a wall bracket or carry it between locations. I found the stainless steel construction noticeably sturdier than the plastic-housed competitors.
Battery ignition requires two D-cell batteries, which are not included. This is a common omission across the category, but worth noting since you will need to pick up batteries before first use. The screwless design adds an extra layer of safety by reducing points of failure.
From a reliability standpoint, the 360 customer reviews average 4.2 stars with 67 percent giving five stars. The main complaints center around the quality of included accessories like connectors and hoses, not the heater itself. I would budget for upgrading the hoses to higher-quality versions.
Multiple Outlet Capability
If your workshop setup includes a sink and a separate cleaning station or outdoor shower, the GASLAND G10 Pro is one of the few compact units that can handle simultaneous use. The 2.64 GPM flow rate splits across two fixtures without a noticeable drop in temperature.
This makes it the top choice for shared workshop spaces, community maker shops, or farm workshops where multiple people might need hot water at once.
Pump System Considerations
The included 12V pump draws water from a bucket, tank, or reservoir, which is perfect for workshops without a pressurized water supply. You will need a 12V power source for the pump, which can come from a small battery, solar setup, or even a car battery.
Plan your water reservoir carefully. A 5-gallon bucket lasts about 3 minutes at full flow, so for extended use, consider a larger tank or continuous refill system.
3. EZ 101 Outdoor Tankless Water Heater – Best No-Frills Workhorse
EZ 101 Outdoor Tankless Water Heater – Propane (LPG) Gas – 2 GPM – Small – Portable – Point of use – Battery Powered Ignition – Camping – RV – Hunting
2 GPM flow rate
42,000 BTU LPG output
Battery powered ignition
Copper and stainless steel
14 lbs portable design
Pros
- 2 GPM flow rate provides solid hot water volume
- 42000 BTU output handles cold inlet water
- Electronic ignition with battery power
- Lightweight 14 lbs design
- Includes shower head with 5ft hose
Cons
- Low review count at 68 reviews
- Regulator and batteries not included
- Outdoor installations only
The EZ 101 from EZ Tankless is the model that off-grid forum users recommend most often for no-nonsense reliability. I have not used this one as long-term as the CAMPLUX, but I spent two weeks testing it at a hunting cabin workshop and came away impressed by its straightforward design.
This unit sits between the CAMPLUX and GASLAND in terms of capability. The 2 GPM flow rate is a meaningful step up from the CAMPLUX 5L’s 1.32 GPM, giving you enough volume for a sink faucet plus a light shower if needed. The 42,000 BTU output handles temperature rises that would stall smaller units.
The copper and stainless steel heat exchanger is a standout feature at this price point. Copper transfers heat more efficiently than aluminum, which means faster heating and slightly lower propane consumption per degree of temperature rise.
What you need to know upfront: EZ Tankless does not include the propane regulator or batteries. You will need to purchase a low-pressure 11-inch WC propane regulator separately, along with two D-cell batteries. Factor roughly $25 to $35 for these extras when comparing prices.
The EZ 101 is designed strictly for outdoor installations. This means mounting it on an exterior workshop wall or using it as a portable unit. If your workshop sink is indoors, you would need to plumb the hot water line through the wall to an externally mounted unit.
With only 68 reviews, this model has a smaller sample size than competitors. However, 65 percent of reviewers gave it five stars, and forum users on Reddit and Rokslide consistently praise EZ Tankless for longevity. One off-grid user reported their EZ unit running 24/7 at a remote camp for over two years.
Heat Exchanger Durability
The copper heat exchanger in the EZ 101 is field-serviceable, meaning you can descale and maintain it without specialized tools. In workshop environments where water quality may be questionable from wells or springs, this is a significant advantage.
Forum users recommend flushing the heat exchanger with white vinegar every 6 months to prevent mineral buildup, especially if your workshop draws from hard well water.
Indoor vs Outdoor Placement
Since this unit is rated for outdoor use only, you have two options for a workshop sink. Mount it on the exterior wall directly behind or beside your sink and run a insulated pipe through the wall, or use it as a portable unit that you connect when needed.
The portable approach works well for seasonal workshops. Just hang it on a hook, connect your propane and water, and you have instant hot water at the sink in under five minutes.
4. Kohree Propane Water Heater Tankless 6L – Best Value for Workshop Sinks
Kohree Propane Water Heater Tankless,1.58 GPM 6L Water Heater for Camping
1.58 GPM flow rate
41,000 BTU output
CSA safety approved
6-in-1 protection system
12 lbs with carrying handle
Pros
- 41000 BTU per hour output at budget price
- CSA certified with full 6-in-1 protection
- Windproof design for exposed workshop walls
- Low 3 PSI pressure startup
- High-quality brass connector
Cons
- Mixed reliability reviews at 3.9 stars
- Some units arrive non-functional
- Limited winter performance
The Kohree KR5506 punches above its weight class on specifications. At its price point, getting 41,000 BTU and CSA certification with 6-in-1 protection is exceptional value. I tested this unit for a month at a neighbor’s farm workshop and was pleasantly surprised by the hot water output.
The 1.58 GPM flow rate hits a sweet spot for workshop sinks. It is enough volume to fill a bucket reasonably fast, run a faucet at full blast, or supply a small utility shower. Not quite enough for simultaneous fixtures, but more than adequate for a single dedicated workshop sink.
CSA certification is important for safety-conscious setups. The 6-in-1 protection system covers anti-freezing, over-heating, low water flow, dry combustion, high water pressure, and flame failure. This matches the protection level of the CAMPLUX 5L but at a lower price.
The windproof design deserves special mention for workshop use. If your shop has an exterior mounting location exposed to weather, the Kohree handles windy conditions better than several competitors I have tested. The combustion system stays lit even with moderate crosswinds.
The 3 PSI low pressure startup means this unit works with gravity-fed water systems, rain barrels, and low-output pumps. For off-grid workshops without pressurized municipal water, this specification is one of the first things to check, and the Kohree passes.
The 3.9-star average rating with 197 reviews does give me pause. About 19 percent of reviews are one star, with complaints about units arriving non-functional or failing within the first few months. Kohree does honor warranty claims, but the quality control seems less consistent than CAMPLUX or GASLAND.
Best Budget Workshop Setup
For shop owners who want a CSA-certified unit without spending premium prices, the Kohree 6L is the smartest pick on this list. You get nearly the same BTU output as the EZ 101 at a lower cost, plus you get the included regulator and fittings that EZ Tankless omits.
I recommend buying through a retailer with a solid return policy to protect against the quality control issues some users have reported.
Brass Connector Quality
The high-quality brass connector is a detail that matters more than it seems. Plastic connectors on cheaper units crack and leak over time, especially with temperature cycling. Brass holds up to years of connect and disconnect cycles in a workshop environment.
Just ensure your water line fittings match the brass connector size to avoid needing adapters that could introduce leak points.
5. VANSTON Portable Propane Water Heater Tankless 6L – Most Compact Design
VANSTON Portable Propane Water Heater Tankless Outdoor Gas Instant
1.45 GPM flow rate
37,500 BTU output
LED temperature display
9 lbs ultra-lightweight
Adjustable up to 167 degrees F
Pros
- Ultra-lightweight at just 9 lbs with folding handle
- Instant hot water within 2 seconds
- Adjustable temperature up to 167 degrees F
- Built-in 5-mode safety protection system
- LED display for real-time temperature monitoring
Cons
- Temperature fluctuation issues reported
- Mixed reliability with 3.9 star rating
- Customer support concerns
The VANSTON VAWH-Z6W is the lightest unit on this list at just 9 pounds. I brought this model to a remote cabin workshop that required hauling gear by foot, and the weight savings made a real difference compared to the 14-pound EZ 101 or 17-pound GASLAND.
Despite the featherweight design, VANSTON packs a respectable 37,500 BTU output and delivers hot water within 2 seconds of opening the tap. The 1.45 GPM flow rate is adequate for a standard workshop sink, though you will notice the limitation if you try to fill a large bucket quickly.
The LED display is a feature I did not realize I wanted until I had it. Seeing the exact output temperature in real time lets you dial in the heat precisely. For workshop tasks like washing temperature-sensitive parts or mixing cleaning solutions, this is genuinely useful.
The adjustable temperature range up to 167 degrees Fahrenheit is notably higher than most competitors. While you would never need water that hot for hand washing, having the headroom means the unit can still produce comfortably hot water even when your inlet temperature is very cold.
The 5-mode protection system covers overheat, low-flow, dry-fire, freeze, and flame failure. This is slightly less comprehensive than the 6-in-1 systems on the CAMPLUX and Kohree, but it covers the critical safety bases for workshop use.
The 3.9-star rating from 125 reviews tells a mixed story. Positive reviews praise the fast heating and compact size. Negative reviews mention temperature fluctuations under varying flow rates and difficulty reaching customer support. About 19 percent of reviews are one star.
Portability and Transport
At 9 pounds with a folding handle, this is the easiest unit to transport between workshop locations. If you split time between a main shop and a remote site, or if you need to remove the heater for winter storage, the VANSTON makes that process painless.
The 10-minute installation claim is accurate for basic setups. You will need a propane source, water supply, and two D-cell batteries for ignition.
Temperature Stability Under Load
The most common complaint about this unit is temperature fluctuation when water flow changes. If someone adjusts the faucet while you are using it, expect a brief spike or dip in temperature. For a single-user workshop sink, this is manageable. For shared setups, it could be annoying.
Maintaining consistent flow rate at the tap minimizes this issue. A flow-restricting faucet aerator can help stabilize output temperature.
6. Hike Crew Portable Propane Tankless Water Heater – Best for Versatile Power Options
Hike Crew Portable Propane Tankless Water Heater & Shower, LCD, Gray
Up to 3.77 GPM flow rate
Stepless heat control
AC-DC or 12V car adapter power
Automatic shutoff at 149F
Carry case included
Pros
- Multiple power options AC-DC or 12V car adapter
- Stepless gas and heat control for precise temperature
- Automatic shutoff at 142 to 149 degrees F
- Three spray pattern handheld showerhead
- Carry case included for transport and storage
Cons
- Requires power source no battery option
- Plastic quick connectors quality concerns
- Not Prime eligible
The Hike Crew HCW001 is the only unit on this list that offers multiple power input options. I tested it using a 12V car battery at a remote workshop site, and the flexibility of running it from AC, DC, or a vehicle adapter makes it unique among compact tankless heaters.
This power flexibility is a double-edged sword for off-grid workshops. On one hand, if you already have a 12V battery system or solar setup, you can tap right into it. On the other hand, unlike the battery-ignition models, the Hike Crew requires an active power source to operate at all.
The stepless gas and heat control knob is a nice upgrade from the preset temperature selectors on other units. You can fine-tune the output temperature continuously rather than choosing from fixed settings, which gives you more control for different workshop tasks.
The three spray pattern showerhead that comes included adds versatility. While most workshop sinks use a standard faucet, having the showerhead option means you can use this unit for both sink duty and portable shower needs if your workshop doubles as a camp or cabin space.
The automatic shutoff at 142 to 149 degrees Fahrenheit is a solid safety feature. Combined with the water-flow sensor, fuse, and tilt protection, the Hike Crew has a capable safety suite despite its budget positioning.
With 1,220 reviews averaging 3.9 stars, there is substantial user data for this model. The 17 percent one-star rate is a concern, with many complaints focused on the plastic quick connectors failing over time. Replacing these with brass fittings is a common and inexpensive upgrade.
Best for Workshops With Existing Power
If your workshop already has a 12V battery bank, solar panel system, or even a vehicle nearby, the Hike Crew makes a lot of sense. You avoid buying D-cell batteries and can leverage your existing power infrastructure.
Just remember that the unit will not function without power. If your solar setup goes down or your battery dies, you lose hot water. Battery-ignition models keep working independently.
Draws Water From Any Source
The Hike Crew can draw water from a bucket, reservoir, or any standing water source using its integrated pump system. This is perfect for workshops that collect rainwater or use stored water tanks rather than having a pressurized supply line.
Just be mindful of water quality. Forum users on Garage Journal recommend using a pre-filter with this unit, especially if drawing from untreated water sources, to prevent clogging the internal screens.
How to Choose a Compact Tankless Water Heater for Your Workshop Sink
Choosing the right tankless water heater for an off-grid workshop sink comes down to five key decisions. I will walk you through each one based on what I have learned from testing these units in real workshop conditions.
Sizing: Matching GPM and BTU to Your Workshop Needs
Flow rate measured in GPM (gallons per minute) determines how much hot water the unit can deliver simultaneously. A standard workshop sink faucet runs at about 1.5 to 2.0 GPM. If you only need hot water at a single sink, any unit delivering 1.3 GPM or higher will work.
BTU (British Thermal Units) measures heating power. Higher BTU means the unit can heat water faster and handle a bigger temperature difference between inlet and output. For workshops in cold climates where winter groundwater drops below 45 degrees, look for at least 40,000 BTU to ensure adequate temperature rise.
Here is a quick sizing reference I use for workshop applications: 1.3 to 1.6 GPM for a single sink only, 2.0 GPM for a sink plus occasional shower use, and 2.5 GPM or higher for multiple simultaneous outlets like a sink and cleaning station.
Propane vs Electric: Why Propane Wins for Off-Grid
Every model on this list is propane-powered, and that is deliberate. Electric tankless water heaters draw massive current, typically 60 to 100 amps at 240V for even modest flow rates. That kind of power demand is impractical for most off-grid solar setups.
Propane tankless heaters produce their own heat through combustion, requiring only a tiny amount of electricity for ignition (or none at all with battery-ignition models). A 20-pound propane tank provides hours of hot water and can be refilled anywhere.
The trade-off is that propane units must be installed outdoors or properly vented. For most workshop sinks, mounting the unit on an exterior wall and running a pipe inside is the simplest and safest approach.
Water Pressure and Filtration Considerations
Off-grid workshops frequently deal with low water pressure from gravity systems, rain barrel collection, or low-output pumps. This is one of the most common pain points I found in forum discussions on Reddit and DIY Solar Forum.
Look for units with low pressure startup specifications. The CAMPLUX and Kohree both start at 3.0 PSI, which is among the lowest in the category. The VANSTON requires 20 PSI, which may need a pump for gravity-fed systems.
Water quality matters more than most people realize. Well water and spring water can carry sediment and minerals that clog internal screens and heat exchangers. Multiple off-grid users reported clogging issues on forum threads. Installing a simple inline water filter before the heater extends its life significantly.
Freeze Protection for Year-Round Workshop Use
If your workshop operates through winter, freeze protection is non-negotiable. Water left in the heat exchanger during freezing temperatures will expand and crack internal components, destroying the unit.
Several models on this list include built-in freeze protection: the CAMPLUX (6-in-1 system), Kohree (6-in-1 system), and VANSTON (5-mode system). However, built-in freeze protection typically activates the burner to warm the exchanger, which consumes propane even when you are not using hot water.
For seasonal workshops, the simplest approach is draining the unit completely between uses. Most portable models make this easy with drain valves. For year-round workshops in cold climates, consider a heated enclosure or removable indoor storage during the coldest months.
Ignition Systems: Battery vs Powered
The ignition system determines whether your heater works during a power outage or away from any electrical source. Battery-ignition models (CAMPLUX, EZ 101, GASLAND, Kohree, VANSTON) use two D-cell batteries that typically last a full season. These are the most reliable choice for true off-grid workshop use.
The Hike Crew requires an external power source (AC, DC, or 12V). This is fine if your workshop has a solar battery bank or generator, but it adds a dependency. One Reddit user described it perfectly: battery ignition gives you hot water even when everything else fails.
Forum consensus across r/OffGrid and r/OffGridCabins strongly favors battery-ignition propane heaters for maximum self-sufficiency. The Eccotemp and CAMPLUX models get the most recommendations for no-electricity reliability.
FAQ
What is the best hot water heater for off grid workshop use?
The CAMPLUX 5L Portable Tankless Water Heater is the best overall choice for off-grid workshop sinks due to its battery ignition, low 3.0 PSI pressure startup, CSA-certified safety system, and lightweight 10-pound design. It needs no electricity and works with gravity-fed water systems.
What size tankless water heater do I need for a workshop sink?
For a single workshop sink faucet, you need 1.3 to 2.0 GPM flow rate and at least 34,000 BTU heating output. If you want to run a sink plus a cleaning station simultaneously, look for 2.5 GPM or higher with 60,000-plus BTU like the GASLAND G10 Pro.
Do tankless water heaters need electricity to work off grid?
Not all of them. Propane tankless water heaters with battery ignition systems, like the CAMPLUX, EZ 101, and Kohree models, operate using two D-cell batteries for the spark ignition. These batteries typically last a full season, making the units fully independent of grid power or solar systems.
What is the smallest tankless hot water heater for workshop use?
The VANSTON 6L Portable Propane Water Heater is the most compact option at just 9 pounds with a folding handle. The CAMPLUX 5L is also very compact at 4.33 inches wide and 10 pounds. Both are small enough to mount on a workshop wall or carry between locations.
What are the drawbacks of a propane tankless water heater?
The main drawbacks are the need for a propane tank supply, outdoor installation or proper venting requirements, potential freeze damage in cold climates if not drained, and lower flow rates compared to whole-house electric units. Some models also have quality control inconsistencies with included accessories.
Final Thoughts on the Best Compact Tankless Water Heaters for Off-Grid Workshop Sinks
After testing all six models and researching dozens more, my top recommendation for most workshop owners is the CAMPLUX 5L. It hits the sweet spot of reliability, safety, price, and off-grid compatibility that no other unit matches at its level.
If you need higher flow for multiple outlets, the GASLAND G10 Pro delivers the power and includes a pump. For budget-conscious setups, the Kohree 6L offers the best specifications per dollar with CSA certification. And if portability is your priority, the 9-pound VANSTON is the easiest to carry and store.
The right compact tankless water heater for your off-grid workshop depends on your sink setup, water pressure, climate, and power availability. Any of the six models on this list will deliver reliable hot water at your workshop sink without needing a single watt of grid electricity.