Thermomate vs Orbek: Tankless Water Heaters Compared by Specs
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When you compare thermomate vs orbek tankless water heater options, you are looking at two very different solutions. Both provide hot water for specific environments, but they serve distinct needs. The Thermomate is a small electric tank for under-sink use in homes. The Orbek is a propane tankless unit designed for RVs. You must choose based on your power source and where you install the unit.
Key differences
| Aspect | Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank | Orbek 60,000 BTU 12V RV Tankless Water Heater |
|---|---|---|
| Fuel Type | Electric | Propane |
| Capacity | 6.5 Gallons | Tankless |
| Voltage | 120 V | 12 V DC |
| Use | Under Sink | RV |
| Dimensions | 17.7 x 17.7 x 14.6 inches | 12.7 x 12.7 x 12.7 inches |
| Certification | UL Listed | CSA |
Which one should you choose?
Choose Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank if
- You need instant hot water for a bathroom sink in a stationary home.
- You have a standard 120V electrical outlet available under the sink.
- You prefer a glass-lined tank with a three-year warranty on the tank.
Choose Orbek 60,000 BTU 12V RV Tankless Water Heater if
- You are installing water heating in an RV or camper.
- You rely on propane and need a 12V DC power supply.
- You want a compact unit that fits standard RV cutouts and includes a remote control.
Verdict: The Thermomate suits homeowners who need a small, reliable electric heater for point-of-use sinks. The Orbek is the better choice for RVers who need propane-powered, continuous hot water in a mobile setting. Your decision depends entirely on your power source and installation location.
Thermomate vs Orbek: Key Spec Differences
Fuel Type
The Thermomate runs on 120-volt electricity, making it suitable for standard household outlets in residential settings. You plug it in and rely on resistive heating elements to warm the water. The Orbek uses propane gas, which is essential for recreational vehicles or off-grid locations where electrical power is limited. Propane allows the Orbek to operate independently of shore power or generators. This distinction defines where each unit can function. You must choose based on your power source availability. If you are in a home with standard wiring, the electric model is the logical choice. If you are traveling or camping, the gas burner provides the necessary flexibility for remote use.
Capacity
Capacity determines how much hot water is available at once. The Thermomate holds 6.5 gallons of pre-heated water in its insulated tank. This stored volume provides a buffer, allowing you to use hot water for a short period even if the heating element cycles off. The Orbek is a true tankless system with zero storage capacity. It heats water only as it flows through the unit. This means you have an endless supply, limited only by the flow rate and burner power. For a bathroom sink, the 6.5-gallon tank is often sufficient for handwashing and dish rinsing. For an RV shower, the tankless design prevents running out of hot water mid-stream, provided the flow is steady.
Power Source
Voltage requirements differ significantly between the two units. The Thermomate operates on standard 120-volt AC power, drawing 12 amps. This allows installation in any kitchen or bathroom with a standard wall outlet, though you must ensure the circuit can handle the load. The Orbek requires 12-volt DC power, typical of RV electrical systems. It draws power for its control panel and fan but uses propane for the actual heating. This makes the Orbek compatible with vehicle batteries or RV converters. You cannot plug the Orbek into a standard home outlet without an inverter, and you cannot run the Thermomate on 12-volt DC. Your existing electrical infrastructure dictates which unit you can install.
Installation Location
Physical dimensions and mounting options define where each heater fits. The Thermomate measures 17.7 by 17.7 by 14.6 inches and weighs 26.5 pounds. Its compact, boxy shape is designed to fit under sinks or counters in residential cabins and kitchens. It can be wall-mounted or placed on the floor. The Orbek is a cube measuring 12.7 inches on each side and weighs 20.5 pounds. Its square form factor is designed to replace standard RV water heater openings, such as 15x15 or 18x18 inch cutouts. It mounts directly into the RV wall structure. If you are outfitting a home kitchen, the Thermomate’s under-sink design is ideal. If you are upgrading an RV, the Orbek fits the standard compartment.
Temperature Control
Both units offer adjustable temperature settings, but the ranges differ. The Thermomate allows you to set the water temperature between 50°F and 149°F using a dial thermostat. This wide range lets you choose between warm water for dishes or hot water for handwashing. It also includes a freeze mode to protect the tank in cold environments. The Orbek features a smart remote control that adjusts water temperature from 95°F to 123°F. This narrower range is optimized for shower comfort and safety in an RV context. The remote displays error codes for troubleshooting. The Thermomate offers more flexibility for varied uses like cleaning, while the Orbek focuses on consistent shower temperatures via its remote interface.
Safety Certifications
Safety certifications ensure the units meet specific regulatory standards for their intended environments. The Thermomate is UL Listed, which verifies it meets safety standards for electric appliances used in residential settings. It includes a temperature and pressure relief valve to prevent tank over-pressurization. The Orbek is CSA Certified, a standard often required for gas appliances in North America, particularly in RVs. It features a forced-draft exhaust fan for stable combustion and automatic gas shut-off if the flame fails. It also includes frost protection. Both units prioritize safety, but the certifications reflect their different fuel types and usage contexts. You should verify that the certification matches your local code requirements for the installation site.
Which tankless water heater fits your needs
Homeowners needing under-sink hot water
You need instant hot water at a specific sink without waiting. This 6.5-gallon electric unit plugs into a standard 120V outlet. It heats water efficiently with up to 99% thermal efficiency. The adjustable thermostat lets you set temperatures between 50°F and 149°F. Its compact size fits easily under most kitchen or bathroom cabinets.
RV owners traveling at high altitudes
You require reliable hot water while camping at elevation. This propane heater features oxygen-free copper heat exchangers and brushless DC fans for high-altitude performance. It delivers 60,000 BTU/hr for continuous flow. The smart remote adjusts water temperature from 95°F to 123°F easily. It also includes frost protection for cold weather trips.
RV owners wanting easy installation
You want to replace an existing RV water heater quickly. This unit fits standard 15x15, 15x18, and 18x18 inch openings. It uses standard NPT water connections and 12V DC power. The built-in 150 PSI pressure-reducing valve simplifies setup. You can install it yourself without professional help, and it includes error codes for quick troubleshooting.
The products compared
Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank
Best for: single sink point-of-use hot water
- Fuel Type
- Electric
- Wattage
- 1.44 kW
- Capacity
- 6.5 Gallons
- Voltage
- 120V
- Temperature Control
- 50°F to 149°F
- Certification
- UL Listed
View on Amazon: Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank Affiliate link
This Thermomate unit is a 6.5-gallon electric tank designed for point-of-use installation under sinks or counters. It operates on 120V power with a 1.44 kW heating element. The glass-lined tank offers 99% thermal efficiency. You can adjust the water temperature between 50°F and 149°F. It includes freeze protection and UL listing for safety. This compact heater fits small spaces where instant hot water is needed.
Pros
- 6.5-gallon capacity for moderate point-of-use needs
- 99% thermal efficiency reduces standby loss
- Adjustable thermostat from 50°F to 149°F
- UL Listed for safety compliance
- Compact 17.7 x 17.7 x 14.6-inch design
Cons
- Requires a dedicated 120V outlet and 12-amp circuit
- Limited to 1.44 kW heating power
- Small 6.5-gallon tank capacity
Good fit if
- You need hot water for a single sink
- You have a 120V outlet near the installation spot
- You want a UL-listed unit for safety
Skip if
- You need whole-house hot water
- You only have propane or 240V power
- You require high-volume simultaneous usage
Verdict: Thermomate 6.5 Gallon Under Sink Heater provides efficient, safe hot water for small spaces. It suits users who need a reliable, UL-listed point-of-use solution for a single sink or counter.
Orbek 60,000 BTU 12V RV Tankless Water Heater
Best for: RVers needing compact propane heating
- Fuel Type
- Propane
- BTU
- 60,000 BTU
- Voltage
- 12V DC
- Temperature Control
- 95°F to 123°F
- Certification
- CSA
- Dimensions
- 12.7 x 12.7 x 12.7 in
View on Amazon: Orbek 60,000 BTU 12V RV Tankless Water Heater Affiliate link
The Orbek RV tankless water heater uses a 60,000 BTU propane burner to deliver continuous hot water. It runs on 12 V DC power and fits standard 15x15, 15x18, or 18x18 inch RV openings. The unit includes a built-in 150 PSI pressure-reducing valve and a smart remote for temperature control between 95°F and 123°F. It also features high-altitude mode for reliable operation up to 9,800 feet.
Pros
- 60,000 BTU/hr propane burner for continuous hot water
- 12 V DC power supply compatible with RV systems
- Built-in 150 PSI pressure-reducing valve
- Smart remote control with 95°F to 123°F range
- High-altitude mode for operation up to 9,800 feet
Cons
- Requires separate purchase of door panels for finished look
- Limited to propane fuel type only
- No mention of WiFi or smart home integration
Good fit if
- You need a compact 12.7-inch cube heater for an RV
- You want a propane unit with high-altitude performance
- You prefer a built-in pressure-reducing valve
Skip if
- You require electric or dual-fuel operation
- You need a unit larger than 12.7 inches
- You want a pre-installed decorative door panel
Verdict: Orbek RV Propane Tankless Heater is a compact, altitude-ready solution for RVers who need reliable propane heating in tight spaces. It fits buyers who value built-in pressure regulation and remote temperature control.
Specifications side by side
| Spec | Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank | Orbek 60,000 BTU 12V RV Tankless Water Heater |
|---|---|---|
| Fuel Type | Electric | Propane |
| BTU | not stated | 60,000 BTU |
| Wattage | 1.44 kW | not stated |
| Capacity | 6.5 Gallons | not stated |
| Voltage | 120V | 12V DC |
| Temperature Control | 50°F to 149°F | 95°F to 123°F |
| Certification | UL Listed | CSA |
| Dimensions | 17.7"H x 17.7"W x 14.6"D | 12.7 x 12.7 x 12.7 in |
| Use | Under Sink | RV |
| Weight | 26.5 pounds | 20.5 pounds |
| Size | 6.5 Gallon | not stated |
| Color | white,blue | Tankless, Silver Water Heater |
| Model | ES700 | HRU-RG060-A1 |
Frequently asked questions
Is the Thermomate actually tankless?
No, the Thermomate is not tankless. It is a 6.5-gallon mini-tank water heater. It stores heated water for later use at a single sink. The Orbek is the true tankless option in this comparison. It heats water on demand without a storage tank. This distinction matters for space and energy use.
Can I use the Orbek in my home?
The Orbek is designed for RVs, not standard homes. It runs on propane and includes built-in pressure regulation for mobile use. It also offers remote temperature control for tight RV spaces. The Thermomate is better for residential under-sink installation. It plugs into a standard 120V household outlet.
How big is the Thermomate unit?
The Thermomate measures 14.6 inches wide, 21.2 inches high, and 17.7 inches long. It weighs 26.5 pounds. These dimensions fit under most standard sinks. The compact size allows it to serve as a point-of-use heater for a single sink or counter area in small spaces.
What fuel does the Orbek use?
The Orbek uses propane gas. It is a 60,000 BTU unit designed for RV applications. This fuel type allows for heating in remote locations without electricity. The unit is altitude-ready and includes a remote temperature control feature for convenient operation in mobile environments.
Which unit is lighter?
The Orbek is lighter than the Thermomate. It weighs 20.5 pounds. The Thermomate weighs 26.5 pounds. The Orbek’s cubic shape, measuring 12.7 inches on each side, makes it compact for RV storage. The Thermomate is larger and heavier due to its 6.5-gallon storage tank.
Does the Thermomate need a special outlet?
No, the Thermomate uses a standard 120V electrical connection. You plug it into a regular household outlet. It does not require a special high-voltage circuit. This makes installation straightforward for under-sink use in most homes. You do not need to upgrade your electrical panel for this unit.
Is the Orbek suitable for a bathroom sink?
The Orbek is not ideal for a standard bathroom sink. It is designed for RV use with propane. The Thermomate is better for bathroom sinks. It provides efficient hot water for a single point of use. Its electric operation and under-sink design fit residential plumbing needs better than the RV-focused Orbek.