NORITZ Tankless Water Heater, Model GQH-27H2FFAAI
27kW Gas Combination Boiler, Dual Servo Control
- Rated heat input 27 kW
- Rated heat output 24 kW
- Minimum start-up flow 2.5 L/min
- Hot water flow (ΔT = 25°C) 14 L/min
Noritz 27kW smart gas combination boilers are a good option for mid-to-high-end residences, including family homes and private villas that need both heating and hot water. The dual servo control system helps keep water temperature steadier in multi-bathroom scenarios, where demand can change quickly. Their built-in Wi-Fi also supports remote fault diagnosis, which can speed up troubleshooting and help reduce after-sales maintenance costs.
PRO-Control dual hot-and-cold servo control keeps hot water temperature very stable, up to ±0.2°C*, helping solve common issues seen in traditional wall-hung boilers
Multi-point use without disruption: multiple kitchen and bathroom taps can be used at the same time with less temperature fluctuation
More comfortable showers year-round: less risk of “too hot” water in summer, and warmer water in winter
Water and gas work together: a stepper motor and gas proportional valve adjust output continuously to keep temperature under control
Fast response: quick calculations and real-time inlet flow adjustment help stabilize temperature sooner
Smart mixing: If water supply is interrupted and then returns, the gas boiler prevents a sudden rush of overly hot leftover water, helping reduce scalding risk
- PRO-The comparison images are based on Noritz internal testing and are for reference only. Actual performance may vary.
- Data is taken from a test report issued by Zhejiang Fangyuan Testing and Certification Group (Report No.: 2411305892).
- Some data is sourced from the Noritz laboratory
| Model | GQH-27H2FFAAI |
| Rated heat input | 27 kW |
| Rated heat output | 24 kW |
| Minimum heating output | 8.1 kW |
| Minimum DHW output | 1 kW |
| Minimum start-up flow | 2.5 L/min |
| Thermal efficiency | ≥ 89% |
| Hot water flow (ΔT = 25°C) | 14 L/min |
| Dimensions (H × W × D) | 740 × 440 × 310 mm |
| Weight | 32.5 kg |
| Water-flow servo motors | 2 |
| Staged combustion | No |
| Circulation pump | 1 |
| 0.5°C temperature control (DHW) | Yes (35–48°C) |
| Heating temperature range | 30–80°C |
| Hot water temperature range | 35–60°C |
| Noise level (sound power / sound pressure) | ≤ 53 / ≤ 39 dB |
| Wi-Fi | Yes |
Variable-Speed Fan
Fan speed adjusts based on demand, which helps keep operation steady while reducing energy use and noise across different working conditions.
Electronic Control Unit
The electronic control unit supports accurate temperature control and efficient operation. Safety protections and built-in fault diagnostics make status checks and troubleshooting easier.
Sealed Combustion Chamber
Insulation and sound-damping materials are used on the side panels to help reduce heat loss and noise, while also helping limit vibration and wear during operation.
Noritz Water Pump
Designed for quiet running to improve comfort in daily use. Self-protection functions help reduce the risk of faults.
Dual Water-Flow Servo System
Controls both inlet and outlet water flow with high precision by coordinating the two flow paths in real time, it helps keep temperature steadier during multi-point hot water use.
Five-Pass Heat Exchanger Design
A five-pass heat exchanger keeps the unit compact while improving heat transfer. Larger main tubes and a longer flow path help absorb more heat.
Italian SIT Proportional Valve
Regulates gas flow and pressure with fast response and high control accuracy. This supports efficient combustion and helps reduce energy use.
Expansion Tank
Helps absorb pressure changes in the water system as temperature varies. It also helps buffer water hammer, protect key components, and support stable operation over time.
- Component Overview
- Installation Dimensions
- PRO-Control dual servo (hot cold) keeps hot water temperature highly stable, within ±0.2°C
- Heating can be set across a 30–80°C range to suit different room needs
- Can be paired with Japanese-style dry underfloor heating, so the floor warms up faster
- Quiet operation is supported through noise-control design, with noise as low as 42 dB(A)
- The built-in Wi-Fi makes it easy to check the unit’s status and adjust settings from a phone.
- Temperature reacts quickly thanks to 7,000 flow-control points and a response time of 0.01 s, with 24/7 dual hot-and-cold control
Noritz H Series tankless water boilers handle both heating and hot water for homes where different spaces are used every day, kitchens, bedrooms, and bathrooms included. They are compatible with Japanese-style dry underfloor heating, helping the floor warm up faster. Compared with many traditional wall-hung boilers, temperature swings are less noticeable in daily hot water use.
Noritz (China) focuses on developing gas wall-hung boilers that meet international standards. Dual water-flow servo temperature control is paired with smart control features to support more stable daily use. Supply partners are carefully selected on a global level, and OEM/ODM customization is available as a cost-effective option. Noritz aims to be a trusted choice for distributors and project contractors worldwide.