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Gas boiler HEATMASTER 70 EVO 2
with water heatercombicommercial

Gas boiler - HEATMASTER 70 EVO 2 - ACV - with water heater / combi / commercial
Gas boiler - HEATMASTER 70 EVO 2 - ACV - with water heater / combi / commercial
Gas boiler - HEATMASTER 70 EVO 2 - ACV - with water heater / combi / commercial - image - 2
Gas boiler - HEATMASTER 70 EVO 2 - ACV - with water heater / combi / commercial - image - 3
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Characteristics

Power source
gas
Type
with water heater, combi
Sector
commercial
Interior/exterior use
indoor
Other characteristics
condensing, with integrated storage tank
Certifications
class A
Power

Min.: 20.9 W
(71.31 BTU/h)

Max.: 74 W
(252.5 BTU/h)

Length

690 mm
(27 in)

Width

787 mm
(31 in)

Height

2,170 mm
(85 in)

Weight

298 kg
(657 lb)

Water heater capacity

315 l
(83.2 gal)

Description

Overview
  • Commercial combi boiler combining domestic combi technology with high-capacity DHW storage using stainless steel tank-in-tank construction.
  • Operates on Natural Gas or LPG (LPG conversion kit supplied for on-site conversion).
  • Condensing operation for both space heating and domestic hot water.
  • Integrated control system with ACVMax Touch interface and multiple connectivity options.


Key features
  • Tank-in-tank stainless steel hot water production tank (total capacity 315 L) enabling high peak and continuous DHW flows.
  • High efficiencies (ErP Class A; efficiencies above Part L (2022) minima) and NOx emissions under 40 mg/kWh.
  • Internal time clock with up to 6 programmes for efficient fuel management.
  • Multiple control options: On/Off, 0-10 V modulation, temperature control; BMS communication via Modbus and OpenTherm compatibility.
  • Corrosion-resistant stainless steel heat exchanger and primary tank to reduce maintenance.
  • Suited to high-demand and critical DHW premises such as hotels and hospitals; BIM & CAD objects available.
  • Integrated legionella protection and condensate recovery.


Schematics - main components (legend)
  • 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) and NTC1 sensor (CH supply)
  • Electrical panel (with spare fuses at the back)
  • ACVMax Touch control panel
  • On-Off switch and automatic air vent
  • Gas pressure switch and gas valve
  • DHW tank dry well (dip tube with temperature sensor)
  • Modulating air/gas premix burner with fan
  • Air inlet


Applications
  • Designed for high-demand commercial domestic hot water (DHW) applications: hotels, hospitals and similar critical hot water premises.


Technical specifications
  • Model: HeatMaster 70 Evo 2
  • Brand: ACV
  • GTIN / EAN: 5400891542552
  • Product number (P/N): 554255
  • 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: Ø 100/150 mm
  • Connection - heating (primary): 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: 9 mbar
  • Max service pressure heating (primary): 3 bar
  • Max service pressure (DHW): 8.6 bar
  • Pressure drop (primary - ΔT10K): 9.3 mbar
  • Height when tilted: 2277 mm
  • Weight (empty): 298 kg
  • Pre-heating time 10→80°C (heat source: boiler): 27 min
  • Reheat time 40→90°C: 37 min
  • Reheat time 40→80°C: 18 min
  • Heating time 10→90°C: 47 min
  • Input max (heating) HCV: 77.6 kW
  • Input max (heating) LCV: 69.9 kW
  • Combustion efficiency: 98.1 %
  • Efficiency at 30% load (EN15502-1): 109.0 %
  • Efficiency at 100% load (50/30°C): 105.8 %
  • Efficiency (max output) 80/60°C: 97.3 %
  • Efficiency (min output) 80/60°C: 97.3 %
  • Efficiency DHW mode ΔT 30K: 103.9 %
  • CO emissions (max output): 34 ppm; (min output): 7 ppm
  • Mass rate of combustion products (gas): 116 kg/h
  • NOx weighted (GCV) (EN15502): 33.1 mg/kWh (NOx class 6)
  • Output power max (80/60°C): 68 kW; Output power max (50/30°C): 74 kW; Output power min (80/60°C): 20.9 kW
  • Gas flow rate (min output): 2.23 m³/h
  • Domestic hot water performance - Peak flow at 40°C: 716 L/10'; Peak flow 1st hour at 40°C: 2455 L/60'; Continuous flow at 40°C: 2087 L/h
  • Domestic hot water - Peak flow at 45°C: 592 L/10'; Continuous flow at 45°C: 1789 L/h
  • Domestic hot water - Peak flow at 60°C: 348 L/10'; Continuous flow at 60°C: 1252 L/h
  • Voltage: 230 V; Frequency: 50 Hz; Protection IP: 20
  • Electrical consumption: 225 W; Electrical power requirements: 1.5 A
  • Sound power level indoors LWA: 60 dB
  • Space heating energy efficiency class: A; Declared load profile: XXL; Water heating energy efficiency class: A (ηwh: 90.0 %)

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.