Choosing a high-efficiency heat pump water heater can cut energy bills and reduce emissions. This article spotlights five top options that excel in energy performance, first-hour delivery, and smart features. We compare residential heat-pump models from Rinnai and include twoAquastrong pool heat pumps for users seeking versatile, high-efficiency water heating for pools. Each product section highlights key specs and how they fit different household needs.
| Product | Brand | Type | Key Benefit |
|---|---|---|---|
| Rinnai REHP80 | Rinnai | Electric Heat Pump Water Heater | Highest UEF, 91 gal first-hour delivery |
| Rinnai REHP65 | Rinnai | Electric Heat Pump Water Heater | High efficiency, 80 gal first-hour delivery |
| Rinnai REHP50 | Rinnai | Electric Heat Pump Water Heater | Compact, 73 gal first-hour delivery |
| AQUASTRONG Pool Heat Pump (100,000 BTU) | AQUASTRONG | Pool Heat Pump | Large-capacity, WiFi control, year-round comfort |
| AQUASTRONG Pool Heat Pump (55,000 BTU) | AQUASTRONG | Pool Heat Pump | Effective for mid-size pools, app-enabled control |
Rinnai REHP80 Electric Heat Pump Water Heater
Rinnai REHP80 is an Energy Star certified electric heat pump water heater. It extracts heat from ambient air to deliver hot water with zero emissions. The unit achieves a Uniform Energy Factor (UEF) of 4.00, supporting reduced energy costs and consistent hot water. It offers high first-hour delivery, up to 91 gallons, making it suitable for households with high hot-water demand. The model supports Demand-Response enabled operation, allowing utilities to reduce energy usage during peak hours and save money.
Rinnai REHP65 Electric Heat Pump Water Heater
The REHP65 model delivers efficient hot water with ambient-air heat extraction and a UEF of 3.90. Energy Star certified, it reduces energy costs while maintaining reliable hot water. It provides up to 80 gallons in the first hour, fitting households of 4–5 with higher water needs. Like other REHP units, it supports Demand-Response to cut energy during peak periods, offering savings and flexibility.
Rinnai REHP50 Electric Heat Pump Water Heater
The REHP50 offers an energy-efficient solution with a UEF of 3.75 and Energy Star certification. It provides up to 73 gallons of hot water in the first hour and operates with zero emissions when pulling heat from the surrounding air. It includes Demand-Response features to help reduce energy costs during peak times, making it a solid option for mid-sized households seeking efficiency without sacrificing hot-water availability.
AQUASTRONG Inverter Pool Heat Pump, 100,000 BTU
Extend swimming seasons with a dual-mode heating and cooling system that maintains water temperatures from 47 to 104°F for heating and 47 to 83°F for cooling. This unit delivers 100,000 BTU of warmth, suitable for large pools up to 26,000 gallons. App control and a timer enable remote adjustments, scheduling, and energy tracking. The inverter technology aims for energy savings and consistent performance across varying conditions.
AQUASTRONG Inverter Pool Heat Pump, 55,000 BTU
This mid-sized pool heat pump delivers 55,000 BTU for faster heating in larger or cooler-climate pools. It supports heating from 47–104°F and cooling from 47–83°F, with app-based control for scheduling and energy monitoring. Inverter technology provides efficiency gains and flexible power management to optimize operating costs while keeping pool water comfortable year-round.
NEW Rinnai RX199iN Condensing Smart Sense Tankless Water Heater
Rinnai RX199iN is a compact tankless option designed for indoor or outdoor installation with propane or natural gas. While not a heat pump model, it provides high-efficiency hot water on demand with up to 11.1 GPM in a space-saving footprint and smart controls. It may be suitable for homes prioritizing endless hot water with flexible venting and high efficiency in gas-enabled systems.
Rheem Liquid Propane Condensing Tankless Water Heater
Rheem’s propane tankless unit offers continuous hot water with a flow rate of 0.4 to 9 GPM. It supports temperatures from 100 to 140°F and includes electric ignition. While not a heat pump, it is a high-efficiency alternative for homes that rely on propane and need on-demand hot water with compact design and efficient operation.
Rinnai REP199iP Smart-Circ Non-Condensing Propane Tankless Water Heater
Rinnai REP199iP provides a built-in recirculation pump and Smart-Circ technology that learns water usage patterns to optimize energy efficiency and convenience. It delivers up to 7.9 GPM indoors and includes multiple warranty options. This model is designed for efficient hot water on demand with smart features for comfortable living spaces.
Buying Guide: Key Purchase Considerations
- Hot water demand: Match first-hour delivery or flow rate to household size. larger families benefit from higher first-hour delivery or higher GPM in tankless models.
- Energy efficiency: Prioritize units with Energy Star certification, high Uniform Energy Factor (UEF), or inverter-driven operation. Inverter systems adapt output to demand, improving efficiency.
- Installation and space: Consider footprint, ventilation (for gas models), and electrical or plumbing upgrades needed for heat pump installations.
- Utility interaction: Demand-Response capability can reduce energy costs during peak hours when paired with smart meters or utility programs.
- Application scope: Heat pump water heaters are ideal for home hot water; pool heat pumps extend efficient heating to pools but serve a different application.
- Climate and ambient conditions: Air-source heat pumps rely on ambient heat; performance can vary with outdoor temperatures for pool or outdoor setups.
- Maintenance and warranties: Look for robust warranties on heat exchangers and controls, plus ease of service access.
- Smart controls: App-enabled operation helps schedule heating, monitor energy use, and integrate with home automation.
- Fuel source considerations: Electric heat pumps depend on electricity; gas tankless options provide on-demand hot water where grid reliability or fuel choice is a factor.