Answering the top buyer question: which tankless gas water heater with a recirculating pump delivers quick hot water, efficiency, and easy control? This guide highlights five Amazon products that align with that need. The selections are best for whole-house hot water, compact spaces, and those seeking Wi‑Fi or smart controls. A quick summary table follows to compare key points at a glance.
| Product | Best For | Recirculation Type | Notes |
|---|---|---|---|
| Rheem IKONIC RECTGH-SR10iN | Mid‑to‑large homes needing reliable flow | Built‑in recirculation | Energy efficient with EcoNet Wi‑Fi |
| Rinnai RSC160iP | Homes with multiple fixtures | Smart recirculation | Compact, indoor installation |
| CrestWave 130W Recirc Pump Kit | Upgrade existing systems | External circulation pump | Three speeds, DIY friendly |
| CRESTWAVE 3/4″ FNPT Recirc Kit | Hydronic or solar compatibility | Integrated pump kit | Kit includes flanges and fittings |
| PROZRTED HBS24-12Z Smart Recirc Pump | Smart control for tanked/tankless | Smart pump with sensors | NSF certified, multiple remotes |
Rheem IKONIC RECTGH-SR10iN Professional Tankless Gas Water Heater
The Rheem IKONIC RECTGH-SR10iN is a gas-fired, condensing tankless water heater with built-in recirculation. It targets homes needing reliable hot water across multiple fixtures with efficient energy use. The unit’s continuous hot water capability is designed to support typical household loads, and the built-in recirculation helps minimize wait times for hot water at distant fixtures. Best for households prioritizing centralized control and energy savings via smart features.
- Best for: medium to large homes and households with frequent hot water demand.
- Why chosen: integrated recirculation reduces water waste and improves comfort.
- Caution: installation may require appropriate venting and electrical considerations; verify local codes.
Rinnai RSC160iP Smart-Circ Condensing Gas Tankless Water Heater
The Rinnai RSC160iP is a compact, indoor condensing tankless gas water heater with Smart-Circ recirculation intelligence. It aims to deliver up to 9 GPM while learning usage patterns to optimize energy efficiency and hot water timing. Built-in Wi‑Fi control enables monitoring and adjustment via mobile devices. Best for homes seeking automated, pattern-based hot water delivery and convenient remote management.
- Best for: homes wanting smart controls and predictable hot water timing.
- Why chosen: adaptive recirculation enhances efficiency and reduces water waste.
- Caution: Wi‑Fi control requires compatible setup and app access; check connectivity in your space.
CRESTWAVE 130W Hot Water Recirculating Pump Kit
This CrestWave kit provides a high-power recirculating pump designed for use with tankless or other hot water systems. It offers three speeds (55/90/130W) and a maximum head suitable for multi-story homes. The DIY-friendly kit includes essential fittings. Best for homeowners upgrading existing plumbing to cut wait times for hot water.
- Best for: upgrading or retrofitting existing hot water loops.
- Why chosen: flexible head height supports various loop lengths.
- Caution: installation requires basic plumbing tools and knowledge of the system loop.
CRESTWAVE Recirc Pump Kit With 3/4″ Flanges
This CrestWave kit features a 3/4″ FNPT flange kit designed for compatibility with a range of heating systems, including solar and boiler setups. It provides a complete DIY-friendly option with basic components to connect recirculation to a tankless or tanked heater. Best for DIY enthusiasts seeking reliable, easy-to-install recirculation integration.
- Best for: DIY projects needing a complete recirc integration kit.
- Why chosen: comprehensive kit reduces separate part shopping.
- Caution: verify flange size and compatibility with your heater model before purchase.
PROZRTED HBS24-12 Smart Instant Hot Water Recirculating Pump System
The PROZRTED HBS24-12Z family offers NSF certification for drinking water safety and a smart pump design with dual temperature sensors. It supports multiple remotes and includes a built-in water flow sensor that activates the pump when a hot water faucet is turned on. Best for households wanting NSF-certified, smart operation across tanked or tankless configurations.
- Best for: homes seeking NSF-certified, smart recirculation with multiple control options.
- Why chosen: built-in sensors improve comfort and energy use; memory function maintains settings.
- Caution: ensure compatibility with existing hot water lines and check for remote control limits.
Buying Guide: Tankless Gas Water Heaters With Recirculation
Key considerations help compare products and choose the right system for your home.
- Household hot water demand: For larger homes with many fixtures, prioritize models with higher GPM (gallons per minute) and robust recirculation capabilities.
- Recirculation control: Built-in recirc features save water and improve comfort. Smart controls and Wi‑Fi apps add convenience by enabling remote monitoring and scheduling.
- Installation and venting: Gas tankless heaters require proper venting and installation clearances. Check local codes and required vent configurations before purchasing.
- Energy efficiency: Condensing models typically use less energy by recovering heat from exhaust. Consider EcoNet or similar ecosystems for energy and water tracking.
- Compatibility: Ensure the unit matches your home’s water demand pattern and your existing plumbing loop length. Retrofit kits may be needed for some setups.
- Smart features vs. simplicity: If you want remote control and maintenance alerts, select models with integrated Wi‑Fi or NSF-certified smart pumps for safer operation.
Frequently Asked Questions
- What is a recirculating pump in a tankless gas water heater?
A recirculating pump speeds hot water delivery by circulating water through the hot water line, reducing wait times at taps.
- Do all tankless gas water heaters include recirculation?
No. Some units require an external recirculation kit or add‑on pump to enable continuous hot water at multiple fixtures.
- Is Wi‑Fi control important for a recirculating system?
Wi‑Fi control adds remote monitoring and scheduling, which can improve convenience and energy management for many households.
- Can I install a recirculation pump myself?
DIY installation is possible for some kits, but gas heater setups often require professional installation due to venting and safety considerations.
- What should I consider when choosing a recirculation kit with a tankless heater?
Focus on compatibility with your heater, head height, pump power, and whether the kit includes essential fittings for a complete install.
- Are these systems safe for cold climates?
Most systems are designed for consistent hot water delivery; ensure the chosen model supports your environmental conditions and has proper freeze protection if installed in unheated spaces.