In villa and large-apartment projects, hot water demand can jump quickly, especially when underfloor heating is also in use. Noritz 30 kW gas combination boilers use dual water-flow servo control to help keep water temperature steady during multi-point use, while still delivering the output needed for higher-flow applications. Quiet operation down to 42 dB and Wi-Fi remote diagnosis add extra support for day-to-day operation and faster troubleshooting.
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Product Highlights
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
Technical Specifications
Model
GQH-30H2FFAAI
Rated heat input
30 kW
Rated heat output
27.5 kW
Minimum heating output
9.8 kW
Minimum DHW output
1 kW
Minimum start-up flow
2.5 L/min
Thermal efficiency
≥89%
Hot water flow (ΔT = 25°C)
16 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 step control
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
Component Overview
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
Features
PRO-Control dual servo (hot + cold) supports stable hot water temperature within ±0.2°C
Heating can be set across a 30–80°C range to suit different spaces and seasons
Compatible with Japanese-style dry underfloor heating for quicker warm-up and better comfort
Designed for quieter running, with noise levels as low as 42 dB(A)
Features built-in Wi-Fi to support remote monitoring and simple setting adjustment
7,000 flow-control points and a 0.01 s response support fast temperature adjustment, with 24/7 dual hot-and-cold control
Applications
Noritz H Series gas combination boilers provide an integrated solution for both space heating and domestic hot water. They are suitable for multiple areas of the home, such as the kitchen, bedroom, and bathroom. The heating system delivers hot water on demand and supports a Japanese-style dry underfloor heating setup, while also improving common pain points found in traditional gas boilers for more stable, whole-home water temperature control.
NORITZ: From Japan, Serving Customers Worldwide
Noritz (China) focuses on providing heating solutions for the global HVAC market that meet international standards. For project contractors and kitchen appliance distributors, Noritz offers heating solutions that stay competitive and are built for lower maintenance. These heating solutions are designed to meet the demanding requirements of large residential homes and light commercial heating projects.
