27kW Gas Combination Boiler, Dual Servo Control, Instant Hot Water
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
These 27kW gas combination boilers are designed for instant hot water and use dual water-flow servo temperature control to help keep outlet temperature steady. The integrated circulation function reduces waiting time at the tap and helps cut down start-up water waste. Their noise-reduction design supports quieter operation, while Wi-Fi smart control allows convenient monitoring during daily use.
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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-27H3FFAQI
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
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 system helps deliver hot water faster across the home
PRO-Control dual servo temperature control helps keep hot water temperature stable (up to ±0.2°C)
Compatible with Japanese-style dry underfloor heating for quick comfort after start-up
Adjustable heating temperature from 30–80°C supports different heating needs
Large glass touch display provides responsive control with a clean, simple interface
Applications
Noritz H Series wall-hung boilers combine space heating and domestic hot water in one solution, making them suitable for different areas of the home, including kitchens, bedrooms, and bathrooms. They can be paired with Japanese-style dry underfloor heating for faster comfort after start-up, while also improving common issues seen with traditional boilers to support more stable whole-home hot water temperature.
NORITZ: From Japan, Serving Customers Worldwide
Noritz (China) uses more than 50 years of R&D experience from the Japan headquarters. By integrating IoT features, it aims to improve day-to-day user experience and offers flexible OEM/ODM customization options for HVAC equipment. Supported by an established kitchen and water-heating supply chain, Noritz (China) provides HVAC project solutions with reliable performance and dependable after-sales support.
