Choosing the right hot water recirculation system can reduce wait times for hot water and cut water waste. This guide reviews five notable heat pump hot water systems, focusing on reliability, ease of installation, and energy savings. Each product section links to its Amazon listing for quick comparison, while the Buying Guide highlights practical considerations to help you pick a system that fits your home and usage.
| Product | Brand | Key Benefit | Notable Feature |
|---|---|---|---|
| Watts Heat H2O Recirc System (0955805) | Watts Premier | Instant hot water with simple DIY install | Thermal bypass, 120V operation |
| VERIWIS Instant Hot Water Recirc Kit | VERIWIS | Silent operation, complete kit | 304 stainless adjustable valve, 24-hour timer |
| Grundfos GRU-595916 Comfort System | Grundfos | Compact, easy install with full kit | Flow 0-9 GPM, 115V |
| PROZRTED HBS24-12 | PROZRTED | NSF certified, multiple modes | 3 speeds, smart memory |
| RAMATA Instant Hot Water Kit | RAMATA | Compatible and versatile kit option | Adjustable valve, timer included |
Watts Heat H2O Recirc System With Timer
The Watts H2O hot water recirculation system uses thermal bypass technology to deliver hot water in seconds at every faucet or shower when needed. The sensor valve opens as the hot line cools, redirects cooled water back to the heater, and closes when the hot water line reaches 98°F. It is designed for standard water heaters, not tankless models. Installation is a straightforward DIY project powered by a 120V supply. The kit includes a durable pump, adapters, valve, screws, and supply lines, all sized for under-sink setup. Expect improved water efficiency and quicker hot water delivery.
Key features include easy 120V operation, quiet performance, and up to 15,000 gallons of annual water savings with hot water ready in about 15 seconds. While it promises strong conservation benefits, performance depends on your existing plumbing layout and the distance from the heater to distant fixtures. The system emphasizes maintenance-free operation after install and a compact pump head that fits into typical under-sink spaces.
VERIWIS Instant Hot Water Recirculating Pump Kit
The VERIWIS kit delivers hot water quickly using thermal bypass technology, returning cooled water to the heater until the desired temperature is reached. It includes a quiet 120V pump, a 304 stainless steel adjustable sensor valve, and complete installation hardware with two supply lines. A programmable 24-hour timer supports flexible hot water availability during peak usage times. This turnkey kit is designed for standard tank water heaters and aims to reduce water waste while cutting energy costs over time.
Pros include a compact, self-contained package that minimizes under-sink clutter and a comprehensive mounting hardware set. Potential considerations involve ensuring compatibility with your existing piping and valve sizing, as well as confirming that a 24-hour timer aligns with your daily routines. The system emphasizes ease of DIY installation and predictable hot water delivery windows.
Grundfos GRU-595916 Recirculation System
The Grundfos GRU-595916 offers a compact, fully integrated recirculating pump system designed for easy installation with a complete kit. It supports a typical 115V supply and provides instant hot water throughout the home plumbing network. The kit’s flow and head specifications are tuned for reliable performance across standard household layouts, making it a practical choice for homeowners seeking robust, factory-backed components. The system is built to minimize standby water waste through consistent circulation and automatic control.
Considerations include compatibility with existing piping and the need for a proper setup to optimize flow rates. Grundfos emphasizes dependable motors and straightforward wiring, but users should verify fitment with their specific heater model and loop configuration. The kit’s reliability and brand reputation are strong points for long-term use.
Watts Hot Water Recirculation System With Programmable Timer (0955800)
This Watts package mirrors the 0955805 design with a programmable timer and sensor valve that maintains hot water readiness by recirculating cooled water back to the heater. As with Watts’ other models, the system claims ease of installation, no return line needs, and minimal maintenance after setup. The inclusion of two adapters, mounting screws, and 12-inch supply lines supports a straightforward under-sink integration for standard tank heaters. It remains an attractive option for homeowners prioritizing immediate hot water proximity and water conservation.
Performance notes include rapid hot water delivery and substantial potential water savings. The system’s effectiveness depends on the distance from the heater to distant fixtures and the user’s ability to complete a clean pipe run under the sink. Weathering the long-term operation of the timer and valve is a practical consideration for households with varying usage patterns.
RAMATA Instant Hot Water Recirculating Kit
RAMATA’s kit is designed for compatibility with standard 595916 and 095580 pump configurations, offering an adjustable hot water recirculating valve and an integrated timer for predictable operation. The system’s 1/2″ NPT connections and included mounting hardware simplify installation in typical residential setups. The valve’s adjustability enables customization of the bypass temperature, helping to balance energy use with comfort. As with similar kits, RAMATA emphasizes a hassle-free DIY approach and versatile compatibility with tank-style heaters.
When evaluating RAMATA, consider how the adjustable bypass valve aligns with your preferred hot water temperature, as well as whether the included valve and sensor components suit your current plumbing geometry. The timer and memory features add convenience, allowing the pump to remember last settings after power cycling, which can improve user experience over time.
Buying Guide: Key Purchase Considerations
- Hot water needs and fixture distance: Longer runs between heater and fixtures benefit more from recirculation, reducing water waste and delaying hot water creation at distant taps.
- Compatibility with tank-type heaters: Most kits are designed for standard tank-style systems. Tankless or combi models may require different configurations or may not be supported.
- Power requirements and installation: Most units run on 120V and are DIY-friendly. Check circuit capacity and space under sinks for the pump, valve, and lines.
- Valve quality and temperature control: Adjustable bypass valves determine when cool water is recirculated back to the heater. NSF certifications or stainless steel construction can indicate durability and safety.
- Timers and smart features: Timers help align hot water delivery with daily routines. Some models offer programmable or memory features to simplify use.
- Maintenance and warranty: Look for kits with robust warranty coverage and materials designed for corrosion resistance, especially in hard-water areas.
- Noise and energy performance: Consider pump noise levels and overall energy impact; modern pumps emphasize quiet operation and energy efficiency.
- Cost of retrofit: While installation is often DIY, the overall cost includes valves, adapters, and mounting hardware. Assess total investment against expected water savings.