30kW Gas Combination Boiler, Dual Servo Control, Instant Hot Water
Rated heat input 30 kW
Rated heat output 27.5 kW
Minimum start-up flow 2.5 L/min
Hot water flow (ΔT = 25°C) 16 L/min
For larger homes with higher hot water demand, Noritz offers these 30kW gas combination boilers as a higher-output heating option. They are made for high-flow use, and the instant hot water circulation function helps cut the delay caused by long pipe runs, so hot water reaches the tap faster and everyday use feels more comfortable.
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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
Upgraded three-pipe circulation system: in addition to the inlet and outlet lines, a dedicated return line creates a separate circulation loop for smoother hot water delivery
Built-in high-quality circulation pump: supports circulation loops up to 120 m and is designed to handle high temperature and corrosion for more stable operation
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-30H3FFAQI
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
34 kg
Water-flow servo motors
2
Staged combustion
No
Circulation pump
2
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 to support stable operation, lower energy use, and quieter running, while providing more precise airflow control across different scenarios.
Electronic Control Unit
Helps manage temperature accurately and improve efficiency. It also supports safety protections, user-friendly operation, and basic fault diagnostics for easier maintenance.
Sealed Combustion Chamber
Uses insulation and sound-damping materials to reduce heat loss and noise. Side-wall protection also helps reduce friction and vibration.
Noritz Water Pump
Designed for quieter operation and improved comfort, with self-protection functions that help reduce fault risk.
Built-in circulation pump
Supports the instant hot water function, reducing waiting time at the tap and helping cut down on water waste, while improving heating and hot water use.
Dual Water-Flow Servo System
Controls inlet and outlet flow more precisely. By coordinating two flow paths, it helps keep water temperature steadier during multi-point use.
Five-Pass Heat Exchanger Design
Helps maximize heat transfer in a compact layout, with a larger main passage and longer heat-exchange flow path for more effective heat absorption.
Italian SIT Gas Proportional Valve
Regulates gas flow and pressure with higher precision and fast response, helping support stable combustion and better energy use.
Expansion Tank
Helps balance pressure changes in the water system, compensates for volume changes caused by temperature shifts, reduces water hammer, and supports more stable operation.
Component Overview
Installation Dimensions
Features
Three-pipe instant hot water circulation helps reduce waiting time for hot water across the home
PRO-Control dual servo temperature control helps keep hot water temperature steady (up to ±0.2°C)
Can be paired with Japanese-style dry underfloor heating for quicker comfort after start-up
Heating temperature can be set from 30–80°C to suit different heating needs
Large glass touch display offers responsive control with a clean, modern interface
Applications
Noritz H Series gas combination boilers combine space heating and domestic hot water in one solution, making them suitable for different home areas such as kitchens, bedrooms, and bathrooms. They can be paired with Japanese-style dry underfloor heating for faster comfort after start-up, while also helping improve common issues seen in traditional boilers to support steadier whole-home water temperature.
NORITZ: From Japan, Serving Customers Worldwide
Noritz is committed to improving the hot water and underfloor heating experience for both residential and commercial projects. Every wall-hung boiler is produced under strict quality control aligned with international standards, and OEM/ODM customization is available to match different project needs. Supported by a well-established supply chain, Noritz (China) provides HVAC system solutions that stay competitive in real-world applications.
