Gas boiler HEATMASTER 85 EVO 2

combicommercialindoor

Overview

• Commercial combi boiler providing high-capacity domestic hot water (DHW) and space heating in a single unit using Tank‑in‑Tank stainless steel technology.
• Compatible with Natural Gas and LPG (supplied with LPG conversion kit).
• Integrated ACVMax Touch control panel and multiple communication options (Modbus, OpenTherm).
• Designed to operate in condensing mode for both heating and DHW production.

Key features

• Compact footprint: eliminates separate boiler and separate hot water cylinder installations.
• ErP space heating class A; NOx weighted < 40 mg/kWh (EN15502) and complies with Part L (2022) efficiency requirements.
• Internal time clock with up to 6 programmes for optimized fuel management.
• Multiple control options: On/Off, 0–10 V modulation, temperature control, BMS via Modbus.
• Stainless steel heat exchanger and Tank‑in‑Tank DHW tank for corrosion resistance and long service life.
• Suitable for high-demand sites such as hotels, hospitals and large commercial buildings.
• Integrated legionella protection and available BIM & CAD objects for system design.

Schematics / Main components

• Concentric flue gas/air inlet box
• Flue gas exhaust tube
• Combustion chamber
• Stainless steel heat exchanger
• Stainless steel "Tank-in-Tank" hot water production tank (primary + DHW)
• Primary circuit separation disc
• Indirect water pre-heater
• Insulation
• Condensate recovery dish + NTC5 sensor (flue gas)
• High efficiency circulator pump
• NTC2 sensor (CH return)
• Electrical panel (with spare fuses at the back)
• ACVMax Touch Control panel
• On-Off switch
• DHW tank dry well (dip tube with temperature sensor)
• Automatic air vent
• Gas pressure switch
• NTC1 sensor (CH supply)
• Gas valve
• DHW safety valve (T & P relief valve - UK only)
• Modulating air/gas premix burner with fan
• Air inlet

Product identifiers

• Model / Commercial name: HeatMaster 85 Evo 2
• Range: HeatMaster Evo 2
• GTIN / EAN: 5400891542569
• Part number (P/N): 554256

Technical specifications (table-like)
Capacity (total): 315 L
Capacity (primary): 125 L
Capacity (domestic hot water): 190 L
Chimney: Max pressure drop in flue pipe: 150 Pa
Chimney: max length of concentric flue pipe: 22 m
Chimney connection: 100/150 Ømm
Connection - heating: 1 ½" F
Connection - DHW: 1" M
Connection gas: 3/4" M
Connection - re-circulation / safety valve: na / 1 F
Connection - safety valve: 1/2" M
Max operating temperature: 87 °C
Water pressure drop boiler at Δt = 20°C: 14 mbar
Max service pressure heating (primary): 3 bar
Max service pressure (DHW): 8.6 bar
Height when tilted: 2277 mm
Weight (empty): 298 kg


Heating characteristics
Pre-heating time from 10 to 80°C (Heat source: boiler): 24 min
Reheat time from 40 to 90°C: 36 min
Reheat time from 40 to 80°C: 16 min
Heating time from 10 to 90°C: 43 min


Combustion
Input max (heating) HCV: 94.4 kW
Input max (heating) LCV: 85 kW
Combustion efficiency: 98 %
Efficiency at 30% load (EN15502-1): 108 %
Efficiency at 100% load (50/30°C): 105.8 %
Efficiency (max output) 80/60°C: 97 %
Efficiency (min output) 80/60°C: 97.5 %
Efficiency DHW mode ΔT 30K: 103.9 %
CO emissions max output: 51 ppm
CO emissions min output: 6 ppm
Mass rate of combustion products (gas): 143 kg/h
NOx weighted (GCV) (EN15502): 29.3 mg/kWh
NOx class (EN15502): 6
Output power max (80/60°C): 82.9 kW
Output power min (80/60°C): 20.5 kW
Output power max (50/30°C): 89.9 kW
Output power min (50/30°C): 20.5 kW approx.
Gas flow rate (min output): 2.18 m³/h


Domestic hot water performance
Peak flow at 40°C: 783 L/10’
Peak flow 1st hour at 40°C: 2895 L/60’
Continuous flow at 40°C: 2534 L/h
Peak flow at 45°C: 646 L/10’
Peak flow 1st hour at 45°C: 2456 L/60’
Continuous flow at 45°C: 2172 L/h
Peak flow at 60°C: 371 L/10’
Peak flow 1st hour at 60°C: 1638 L/60’
Continuous flow at 60°C: 1520 L/h


Electrical characteristics
Voltage: 230 V
Frequency: 50 Hz
Protection IP: 20
Electrical consumption: 266 W
Electrical power requirements: 1.9 A


Eco Design & performance classes
Space heating energy efficiency class: A
Seasonal space heating efficiency (35°C): 92 %
Declared load profile: XXL
Water heating energy efficiency class: A
Water heating energy efficiency [ηwh] (EU 814/2013 Art 2 (15) Ann.IV-3): 88.5 %
Sound power level indoors LWA: 61 dB


Characteristics / Technical specifications

• Model: HeatMaster 85 Evo 2
• GTIN / EAN: 5400891542569
• Part number: 554256
• Capacity (total): 315 L
• Primary capacity: 125 L
• DHW capacity: 190 L
• Max operating temperature: 87 °C
• Max service pressure (heating): 3 bar
• Max service pressure (DHW): 8.6 bar
• Output power (80/60°C) max: 82.9 kW
• Output power (50/30°C) max: 89.9 kW
• Combustion efficiency: ~98 %
• NOx weighted (GCV): 29.3 mg/kWh
• Declared load profile: XXL
• Water heating energy efficiency [ηwh]: 88.5 %
• Electrical consumption: 266 W
• Support for Natural Gas and LPG (LPG kit supplied)
• Integrated legionella protection
• BIM & CAD available