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High efficiency condensing boilers
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Technical Data
Performance Data
Dimensions
HeatMaster® 25C
Condensing, high performance
heating and hot water combination
boiler, designed for residential and
smaller commercial applications.
The HeatMaster 25C brings the benefits of HeatMaster into residential
and small commercial applications. ACV’s unique integrated Tank-in-
Tank method of hot water storage ensures the HeatMaster 25C
delivers responsive, reliable heating and hot water for all seasons.
Responds to high peak demand and high continuous flow
• 35 kW input during production of domestic hot water
• 365 litres of hot water in the first 10 minutes
• 25 kW input in heating mode
Efficient, hot water production with low emissions
• NOx Rating (EN483) 22.8/kWh
• Seasonal Efficiency 96.8%*
*Seasonal Efficiency Building Regs. L2A & L2B: Section 2.4 equation 2.
Tank in tank hot water storage
• Stainless steel Tank-in-Tank design with proven long life reliability
• Anti-Legionellae: hot water stored at consistently high temperature
Ideal for renovation applications
• No need for bypass: simplified installation
• Adaptable to all types of existing installation
General Features
• Fully modulating burner
• Self-cleaning heat exchanger
• No sacrificial anode required
• Stainless steel Tank-in-Tank DHW cylinder
• Can also be used as a stand alone water heater
High efficiency condensing boilers
12
HeatMaster® 25C
HeatMaster® 25C
NAT GAS
LPG
Input max/min
kW
35/6
30/6
Output max/min
kW
24.2/5.8
24.2/5.8
Efficiency at 100% load 80/60°C
%
96.5
96.5
Efficiency at 100% load 50/30°C
%
107.0
107.0
Efficiency at 30% load [EN677]
%
107.5
107.5
Seasonal efficiency
%
96.8
96.8
NOx Rating (EN483) Class 5
mg/kWh
22.8
45
Total capacity
L
201.5
201.5
Primary capacity
L
126.5
126.5
Primary flow & return connection (F)
ø
1"
1"
Secondary hot water connection (M)
ø
3/4
"
3/4
"
Gas connection (M)
ø
3/4
"
3/4
"
Max length concentric flue
mtr
20
20
Weight empty
kg
158
158
Natural gas flow rate - 20mbar
m
3
/h
2.64
Pressure drop
mbar
30
30
Maximum operating temperature
°C
90
90
HeatMaster® 25C
Litres in first 10 minutes
40°C
365
Litres in first 10 minutes
45°C
300
Litres in first 10 minutes
60°C
200
Litres in first hour
40°C
1172
Litres in first hour
45°C
989
Litres in first hour
60°C
688
Continuous flow 40°C
Ltrs/hr
976
Continuous flow 45°C
Ltrs/hr
836
Continuous flow 60°C
Ltrs/hr
586
Initial heat up time 10°C to 80°C
Min
30
Dimensions with Chimney Adapter
H
1700mm
W
590mm
D
750mm
Dimensions without Chimney Adapter
H
1700mm
W
590mm
D
716mm
590
00
71
05
3
31
2
51
01
360
370
61
7
07
7
1.
Cold water inlet
2.
Auto-air vent
3.
Stainless steel “Tank-in-Tank” hot water cylinder
4.
Safety valve (3 bar) + pressure gauge
5.
Modulating AIR/GAS premix burner
6.
Domestic hot water outlet
7.
Gas connection
8.
Stainless steel heat exchanger
9.
Heating circuit10. Control panel
11. Expansion vessel
12. Rigid expanded polyurethane foam insulation
13. Boiler charging pump
14. Base
