Best on-Demand Water Heaters: Gas or Electric Options for Home and RV
On-demand (tankless) water heaters provide hot water only as needed, reducing energy use and clutter. This article highlights five top choices that cover gas and electric, residential and RV applications. Each product section includes a quick feature snapshot and practical considerations to help you compare installation needs, efficiency, and hot-water capacity for multiple uses.
Product Summary
| Product | Type | Brand |
|---|---|---|
| Orbek 60,000 BTU RV Tankless Water Heater | Gas, RV, Propane | Orbek |
| SIVUATEK 14kW Electric Tankless Water Heater | Electric, Home | SIVUATEK |
| Rheem 11kW 240V Tankless Electric Water Heater | Electric, Home | Rheem |
| APUS Tankless Water Heater Propane Gas | Gas, Indoor | APUS |
| Rinnai RX199iN Condensing Tankless Water Heater | Gas, Indoor/Outdoor | Rinnai |
Notes: All products in this selection support on-demand hot water and offer varying capacities, installation requirements, and fuel sources. Read each section for a concise overview of suitability for home use, RV living, or multi-outlet scenarios.
Orbek 60,000 BTU RV Tankless Gas Heater
Output: 60,000 BTU with 3.5 GPM heating capability, designed for RV families. The unit activates only on demand, reducing propane use. High-altitude compatibility and staged combustion help maintain stable temperatures and efficiency. The system includes a multi-function controller and is available in multiple color options to fit various RV interiors. The built-in remote control simplifies operation while camping or on the road.
Orbek 60,000 BTU RV Tankless Gas Heater (Second Model)
Provides continuous hot water with 60,000 BTU and 3.5 GPM, optimized for RV use. Features include oxygen-free copper heat exchangers, brushless DC fans, high-altitude operation, and a smart remote that adjusts temperature from 95°F to 123°F. The system is designed for easy retrofitting and compatibility with other brands, making it a practical upgrade for existing RV setups.
Rheem 11kW 240V Tankless Electric Water Heater
Compact electric unit with self-modulating power control and adjustable digital temperature display. Delivers up to 2.68 GPM with an 11 kW heating element, targeting efficient use. Ideal for under-sink installation or small spaces, and designed to reduce standby energy consumption compared with traditional tank heaters. Suitable for one or two simultaneous outlets at modest hot-water demands.
Rheem 18kW 240V Tankless Electric Water Heater
Features external digital thermostatic control with LED display and advanced self-modulation. Delivers up to 4.4 GPM with durable copper immersion heating elements. Field-serviceable design supports flexible installation and maintenance, making it a strong choice for households with higher simultaneous hot-water needs across showers, sinks, and laundry.
APUS Tankless Water Heater Propane Gas
Upscaled propane-on-demand unit delivering up to 95,000 BTU and 4.42 GPM. Designed for simultaneous hot water with stable set temperatures (95–140°F). Combines oxygen-free copper heat exchangers and segmented combustion for improved efficiency. Includes a smart digital display and robust cooling features for reliable operation in varying climates and during peak usage.
Rinnai RX199iN Condensing Tankless Water Heater
Versatile, indoor/outdoor capable tankless heater supporting up to 11.1 GPM and dual-fuel compatibility (propane or natural gas). Condensing technology improves efficiency, and the unit includes modern controls and flush capability for maintenance. Suitable for larger homes or multi-fixture needs, with a compact footprint and flexible venting options for installation versatility.
Buying Guide: Key Purchase Considerations
- Fuel Type and Availability: Choose between gas (propane/natural gas) or electric based on your existing supply, installation space, and climate. Gas units typically provide higher flow at higher demand but require venting and gas lines. Electric models avoid venting but need adequate electrical capacity.
- Hot Water Demand: Estimate gallons per minute (GPM) needed for your household or RV usage. Multi-point use (shower, sink, dishwasher) requires higher capacity or staged heating to prevent cold-water shocks.
- Installation Space and Clearances: Check local codes for venting, clearance around intake/exhaust, and electrical panel access. Some models are designed for under-sink or compact wall installations, while RV units require space and compatibility with existing RV systems.
- Efficiency and Energy Use: Look for energy factors (EF/UEF) and self-modulating technology. Higher efficiency reduces ongoing energy costs, particularly in households with frequent hot-water use.
- Maintenance and Serviceability: Consider features like easy flushing, accessible heating elements, and remote monitoring. Brands with good service networks can ease ongoing maintenance and repairs.
- Ventilation and Piping: Gas units require venting and proper gas line sizing. Electric units may need a dedicated electrical circuit and anti-scald devices for safety at distant taps.
- Temperature Control: Precise digital controls and remote or smart features help manage comfort and energy usage. Ensure the range covers typical household temperatures and is user-friendly for all household members.
- Reliability in High Altitude or Cold Climates: Models with high-altitude ratings and frost protection are beneficial for mountain or remote locations and RV travel through varied terrains.
- Warranty and Support: Review warranty length and what it covers (heat exchanger, parts, labor). Check availability of local technicians or brand support for easier troubleshooting.