Best Point Of Use Water Heaters For Rvs

A point-of-use water heater can give an RV sink hot water close to the tap, which may cut down on waiting and wasted water. The right choice depends on where you want hot water, how much electrical capacity your RV has, and whether you need a small under-sink unit or a heater designed to replace the RV’s main water heater. The options below include both localized sink heaters and one RV propane system, so check the installation details carefully before choosing.

Quick Comparison

Our Picks: Best Point Of Use Water Heaters For Rvs reviews

ThermoMate 4.5kW: A Compact Tankless Pick for One Sink

This compact electric tankless unit is designed to sit near a faucet and heat water on demand. Its temperature range is 85°F to 131°F, and its listed flow range is 0.26 to 1.0 gallons per minute. That makes it a potential fit for handwashing or other single-sink tasks, rather than a whole-RV hot-water supply.

The heater measures 10.95 by 7.4 by 2.52 inches and has a digital control panel with one-degree adjustments. Its heating element is separated from the water line, and the unit uses a stainless-steel water tube. Those details may be useful in a tight cabinet, though you will still need room for plumbing connections and safe access to the electrical installation.

The key RV consideration is its electrical demand. The supplied specifications call for a 120V hardwired connection and a 40A double-pole breaker. That is a substantial circuit requirement for an RV setup, so do not assume it can run from a standard outlet, inverter, or existing circuit. Confirm compatibility with your RV’s electrical system and have the wiring assessed before buying.

Compared with the 3.5kW ThermoMate, this model offers higher listed wattage and a broader stated flow range. The tradeoff is that it still provides point-of-use hot water only and requires a dedicated hardwired installation.

Pros:

• Compact body for a small cabinet or sink area
• Adjustable digital temperature control
• Heats on demand instead of storing hot water
• Stainless-steel water tube and separated heating element

Cons:

• Requires hardwiring and a specified 40A double-pole breaker
• Designed for point-of-use flow, not multiple fixtures or showers

Verdict: Consider this ThermoMate if you need hot water at one sink and your RV can safely support its specified circuit; skip it if you need a plug-in solution or a full RV water-heater replacement.

ThermoMate 3.5kW: A Smaller Tankless Option for Low-Flow Use

This 3.5kW model is a small, hardwired electric heater intended for a sink. It measures about 7.9 by 6.4 by 2.5 inches and has a listed flow rate of 0.4 to 0.66 gallons per minute. Its temperature setting range is 86°F to 131°F, with automatic power adjustment as flow and incoming water temperature change.

Its smaller size can help when cabinet space is limited. The unit also has a digital touch panel, a stainless-steel water tube, and a heating element designed to reduce scale and mineral buildup. The listed electrical requirements are 120V, 29.2 amps, hardwired, and a 32A double-pole breaker. Those requirements make it important to check your RV’s wiring and power supply before installation.

At a sink, a modest flow rate can be useful for washing hands or doing brief cleanup. It is not a strong match for a shower or for running several fixtures. Some owners describe compact tankless units as convenient for quick sink use, but performance will depend on incoming water temperature, flow, and the available electrical supply.

Compared with the 4.5kW ThermoMate, this unit has lower listed wattage and a lower maximum flow range, but it is also physically smaller. It may suit a simple sink setup if your electrical system can handle the specified load.

Pros:

• Very compact form for a crowded cabinet
• Temperature control adjusts in one-degree increments
• Self-modulating power responds to flow and inlet temperature
• Designed for on-demand use at a sink

Cons:

• Must be hardwired and requires a specified 32A double-pole breaker
• Its listed flow range is limited for higher-demand uses

Verdict: This is a practical candidate for a low-flow RV sink only when you have the right dedicated circuit and do not expect it to serve as a shower heater.

ORBEK RV Propane Tankless: Best Match for a Compatible Main-Heater Replacement

Unlike the under-sink electric models, this ORBEK unit is an RV tankless water heater intended to supply hot water for everyday RV use, including showers, dishwashing, and handwashing. It uses a 60,000 BTU propane burner and a 12V DC power supply. This makes it a different kind of choice: it is better considered as a possible replacement for a compatible RV water heater than as a small heater installed beside one sink.

The unit is designed around common RV water-heater openings, with stated compatibility for 15-by-15-inch, 15-by-18-inch, and 18-by-18-inch cutouts. Door panels are available separately, so check your existing opening and panel needs before ordering. It also has a temperature range of 95°F to 123°F, a built-in 150 PSI pressure-reducing valve, and a high-altitude mode described for operation at elevation.

Owners describe straightforward fit and installation in some compatible RVs, as well as steady hot water during use. Still, installation involves the RV’s propane, water, and electrical systems. A similar-looking cutout alone does not confirm that the unit is a safe or compatible replacement; compare the installation instructions and your RV’s existing setup, and use qualified help where needed.

For a camper that needs localized hot water at a single sink, this is likely more system than necessary. For someone replacing a compatible RV heater and wanting on-demand propane hot water, it is the most RV-specific option in this group.

Pros:

• Designed for RV water-heater replacement applications
• Propane burner provides hot water for multiple everyday RV uses
• Uses 12V DC power and standard NPT water connections
• Includes a built-in pressure-reducing valve and high-altitude mode

Cons:

• Not a simple plug-in, under-sink point-of-use appliance
• Requires careful confirmation of cutout, propane, water, and electrical compatibility

Verdict: Choose the ORBEK if you are replacing a compatible RV main water heater and want a propane tankless system; choose a small electric unit if your goal is only to add hot water at one sink.

Electrolux 1.5-Gallon Mini Tank: A Plug-In Choice for an RV Sink

The Electrolux is a small storage-tank heater rather than a tankless model. Its 1.5-gallon tank keeps a limited amount of hot water ready near the fixture. The product is listed for RVs and other compact spaces, and it includes a 120V power cord, which may make installation simpler than the hardwired tankless options when a suitable outlet is available.

Its dimensions are listed as 10.1 by 12.3 inches, with a depth of 10.1 inches, and its heat output is 1,440 watts. The product details also list overheat protection, a pressure-release valve, leak detection, and a six-year tank warranty. Measure your cabinet carefully and confirm there is room for the heater, fittings, and service access.

A mini tank can be a sensible fit when you want a small reserve of hot water without adding a high-wattage tankless circuit. The limit is capacity: 1.5 gallons is not an endless supply, so longer or higher-flow tasks will use the stored hot water. It also needs to recover after that supply is used, unlike an on-demand unit.

Compared with the hardwired ThermoMate and CAMPLUX units, this model prioritizes a plug-in setup and stored hot water over continuous tankless heating. That makes it one of the more approachable options for a suitable RV outlet, but not necessarily the best choice if you need a long run of hot water.

Pros:

• 120V plug-in design with power cord included
• Compact 1.5-gallon capacity for localized use
• Listed safety features include overheat protection and leak detection
• Product details specify a six-year tank warranty

Cons:

• Limited stored hot-water capacity
• Requires cabinet space and time to reheat after use

Verdict: Consider this Electrolux if you want a simpler plug-in heater for an RV sink and can work within a small tank’s capacity; avoid it if continuous hot water is your priority.

CAMPLUX 4.5kW: Tankless Heating with a Low Activation Flow

This CAMPLUX electric tankless heater is built for one sink, with a compact body measuring about 10.9 by 7.4 by 2.52 inches. It has a digital temperature display, self-modulating power, and a listed activation flow of 0.26 gallons per minute. The product information gives a temperature rise of 50°F at 1 gallon per minute, an important detail when estimating how warm the outlet water may be in your conditions.

The unit is listed as 4.5kW and 120V, and it must be hardwired rather than plugged in. Its stated installation requirement is a 40A circuit breaker. That makes electrical compatibility a central question for RV owners: verify the required circuit, wiring, and available power with a qualified electrician before purchase. Do not rely on the advertised compact size alone to judge whether it will fit your RV system.

For sink use, the low activation-flow figure may help when running water gently, while the adjustable display allows temperature changes. Some owners describe compact point-of-use heaters as useful for warm handwashing and dish cleanup. As with any small tankless heater, actual output depends on flow and incoming water temperature, and this model is not presented as a whole-RV shower heater.

Compared with the ThermoMate 4.5kW, it has a similar stated wattage and similarly demanding hardwired electrical requirements. Its listed one-gallon-per-minute temperature rise gives a useful reference point, while the ThermoMate lists a broader flow range. Neither is a plug-in option.

Pros:

• Compact size for a single sink installation
• Self-modulating power and a digital temperature display
• Listed activation flow starts at 0.26 gallons per minute
• Product information includes a temperature-rise figure at 1 gallon per minute

Cons:

• Must be hardwired and has a stated 40A breaker requirement
• Designed for one sink, not continuous hot water for an RV shower

Verdict: The CAMPLUX is worth considering for one sink if your RV electrical system supports its hardwired load; choose a mini tank or an RV-specific propane system if those better match your power setup and hot-water needs.

How to Choose a Point-of-Use Water Heater for an RV

Decide Whether You Need Sink Hot Water or a Main Heater

A point-of-use heater serves a nearby fixture, such as a bathroom or kitchen sink. It is useful when you want warm water without waiting for water to travel through long pipes. It generally is not a replacement for an RV’s main water heater. If you want hot water for showers and several fixtures, look at an RV-rated system such as the propane tankless option and confirm that it matches your existing installation.

Match the Heater to Your RV’s Power Supply

Check the heater’s voltage, wattage, breaker, and wiring requirements against your RV’s actual electrical setup. The tankless electric models here require hardwiring and specify high-amperage breakers, so they should not be treated like ordinary plug-in appliances. Consider how the heater will work with shore power, your RV’s circuits, and any inverter use. Have an electrician confirm the installation rather than guessing from the voltage alone.

Choose Between a Mini Tank and Tankless Design

A mini tank stores a small supply of heated water, which can be convenient when you have a compatible outlet and want a straightforward localized source. Its supply is limited and needs time to recover after use. A tankless unit heats water as it flows, but its output depends on flow rate, incoming water temperature, and available electrical power. Think about your real use: handwashing and brief cleanup are different demands from washing dishes for an extended period.

Check Flow Rate and Temperature Rise

For a tankless heater, look at both the minimum flow needed to activate it and the temperature rise it can provide at a stated flow rate. A low activation threshold may help with gentle sink use, but it does not guarantee a particular outlet temperature in every setting. Colder inlet water and higher flow can affect the result. Use the product’s listed figures as a guide, and avoid assuming a sink heater can supply a comfortable shower.

Measure the Installation Space and Connections

Measure the available cabinet or wall area, including space for water fittings, wiring, and access for maintenance. Check the heater’s dimensions and connection type, then compare them with your RV plumbing. For a replacement RV heater, measure the existing cutout and confirm the needed exterior door or panel. A unit that fits the opening still needs to match the RV’s water, propane, and electrical connections.

Consider the Energy Source and Your Travel Style

Electric models may be convenient when you have enough electrical capacity, while a propane RV heater may make more sense for an RV system already set up for propane water heating. Your choice should reflect where and how you camp, what power is available, and whether you are adding a sink heater or replacing the main system. Do not buy based on fuel type alone; confirm the exact installation requirements first.

Review Safety Features and Installation Needs

Look for details that matter to your installation, such as overheat protection, leak protection, pressure control, and any stated certification. Check the manufacturer’s installation instructions and warranty terms before starting work. Electrical, plumbing, and propane connections can create safety risks if installed incorrectly, so use a qualified professional when the job is outside your experience.

Frequently Asked Questions

Can I use a point-of-use water heater in an RV?

Yes, if the heater is suitable for the RV’s available power, plumbing, and installation space. A small unit can provide hot water close to one sink, but you should confirm its electrical requirements and intended use before installing it.

Can an under-sink electric heater run an RV shower?

The electric tankless models in this guide are described as point-of-use heaters for a sink, not whole-RV shower systems. Their stated flow ranges and electrical requirements make them better suited to localized, low-flow tasks. For shower use, consider an RV water heater designed for that purpose.

Is a mini-tank or tankless heater better for an RV sink?

It depends on your power supply and how you use hot water. A mini tank stores a limited amount and can be convenient with a suitable outlet. A tankless unit avoids storing hot water but must have the right hardwired circuit and may deliver less temperature rise as flow increases.

Can I plug in the ThermoMate or CAMPLUX tankless models?

No. The supplied product details state that these tankless models must be hardwired. Check the specified breaker and wiring requirements with a qualified electrician before choosing either one.

Will the ORBEK heater fit any RV that has a water heater?

No. Its listed cutout sizes may fit some RV openings, but you must confirm the dimensions and compatibility of the propane, water, and electrical connections. Also check whether a separate door panel is needed for your installation.

What should I check before installing an RV water heater?

Confirm the required voltage, breaker and wiring, plumbing connections, mounting dimensions, available clearance, and any propane requirements. For a replacement unit, compare the existing cutout and connections with the new heater’s instructions. Ask a qualified installer to assess the work when needed.

Final Recommendation

For a simple under-sink setup, the Electrolux 1.5-gallon mini tank is the most straightforward choice here if your RV has a suitable 120V outlet and you can work with its limited stored supply. The ThermoMate and CAMPLUX tankless units may suit a single sink, but their hardwired, high-amperage requirements make electrical compatibility essential. If you are replacing an RV’s main water heater and want propane operation, the ORBEK is the most purpose-built option in this group—provided its cutout and connections match your RV.