Best Tankless Hot Water Heaters for on-Demand Home Comfort
When you need hot water on demand without the bulk of a storage tank, a tankless system can be the right choice. This guide highlights five practical options that fit different homes and usage patterns. The EcoSmart ECO 11 is compact and energy-efficient for small or point-of-use needs. The Rheem RTEX-24 suits larger homes with high, consistent hot-water demands. The ORBEK 14kW model serves multi-point use at a budget-friendly price. The Ranein Natural Gas unit targets steady supply for multiple fixtures with gas power. And the Rheem 11kW offers a compact electric option for moderate demand. The table below helps you compare key uses at a glance.
| Product | Best For | |
|---|---|---|
| EcoSmart ECO 11 | Small homes, apartments, or point-of-use | Electric |
| Rheem RTEX-24 | Whole-home with higher flow needs | Electric |
| Orbek 14kW | Two to three uses at once with LED display | Electric |
| Ranein Natural Gas 4.3 GPM | Gas-powered, steady supply for multiple fixtures | Gas |
| Rheem 11kW | Compact electric option for moderate demand | Electric |
EcoSmart ECO 11 Electric Tankless Water Heater
The EcoSmart ECO 11 is a compact electric model designed for on-demand heating in smaller homes or at point-of-use. It features self-modulating technology to adjust energy use based on demand, helping to reduce energy waste while delivering consistent water temperature within about one degree of the set point. Its 13 kW capacity at 240 volts makes it a strong fit for single-tap showers or small apartments. Best for budget-conscious buyers who need space-saving installation and predictable performance where water use is intermittent rather than all-day.
Best for: small households, apartments, or locations needing space-saving, energy-efficient hot water on demand.
Caution: Electric demand may require upgrading the electrical panel or dedicated circuit if other high-power appliances run concurrently.
Rheem RTEX-24 24kW Electric Tankless Water Heater
The Rheem RTEX-24 delivers higher electrical capacity for whole-home hot water with more reliable flow, particularly in homes with multiple simultaneous uses. It uses 24 kW at 240V and requires a robust electrical setup, including three 40-amp breakers and a large service panel. This model’s on/off dial and adjustable temperature (in 1-degree increments from about 80–140°F) provide precise control for consistent comfort. Best for: households with greater hot-water demand where an electric solution is feasible and electrical capacity is ample.
Limitation: Installation demands a suitable electrical infrastructure; confirm panel space and breakers before purchase.
Orbek 14kW Tankless Electric Water Heater
The Orbek 14kW electric unit provides up to 3.38 GPM of on-demand hot water, suitable for two to three points of use. It features a LED digital display and an ETL certification for safety. The model notes a 240V/60A two-pole breaker and guidance about ensuring the home’s total circuit capacity—helpful for households with other high-powered appliances. Best for: homes needing multi-point use at moderate flow where an electric, bright-display option is preferred.
Caution: Proper electrical service is essential; verify that your panel accommodates the required amperage and total capacity.
Ranein Natural Gas Tankless Water Heater
The Ranein natural gas model provides up to 100,000 BTU and 4.3 GPM, making it a strong choice for households needing reliable hot water across multiple fixtures. Features include automatic adjustment to seasonal water temperature changes and preset temperatures suitable for kitchen use, plus specific functions for bathroom and tub scenarios. Best for: homes with natural gas supply and a need for steady, scalable hot water across several uses.
Limitation: Gas-powered units require venting and may involve local code considerations beyond the unit itself.
Rheem 11kW Electric Tankless Water Heater
The Rheem 11kW model offers a compact electric option with self-modulating power control and an adjustable digital temperature display. With a maximum flow capacity around 2.68 GPM, it is well-suited for modest demand scenarios where space and energy efficiency are priorities. Best for: smaller homes or apartments where electric power is readily available and you want predictable temperature control.
Note: Despite its compact size, flow rates depend on incoming water temperature and your total hot-water needs across fixtures.
Buying Guide
What to consider when choosing a tankless water heater:
- Electric vs gas: Electric models are easier to install in apartments or homes without gas lines; gas units provide stronger flow at higher demand but require venting and fuel considerations.
- Flow rate and temperature rise: Determine the GPM you need at your coldest incoming water temperature. Higher GPM or lower incoming temps demand more power or gas capacity.
- Electrical service and space: Electric units may need panel upgrades. Verify breaker size, available space, and mounting options for wall installation.
- Point-of-use vs whole-home: Point-of-use heaters are ideal for a single bathroom or sink; whole-home models must cover multiple outlets with adequate capacity.
- Control and features: Look for digital temperature control, self-modulation, and safety features such as overheating protection and anti-scaling considerations.
- Installation considerations: Venting for gas units, allowed installation locations, and local code compliance should be checked before purchase.
How to decide quickly
- Choose electric if you have limited space, no gas line, and modest hot-water needs.
- Choose gas if your household uses hot water across several fixtures with higher, simultaneous demand.
- Choose a unit with self-modulating or adjustable temperature for precise comfort control.
FAQ
- What is a tankless water heater? A device that heats water on demand without storing a supply in a tank, which can save energy when used efficiently.
- Do tankless heaters work well in cold climates? They can, but cold incoming water reduces temperature rise. Consider units with higher heat output for low-water temperatures.
- Can I install these myself? Some models are DIY-friendly, but electrical and gas venting requirements may require a licensed professional.
- Do tankless heaters use less energy? Generally yes, because they heat only when water is used, avoiding standby heat loss of tanks.
- How do I determine the right size? Calculate your peak simultaneous demand in GPM and match to the unit’s heating capacity and temperature rise at your location.
- Are there safety concerns? Ensure proper venting for gas models and correct electrical service for electric units to prevent hazards.