High efficiency condensing combination boilers 15
Technical Data
HeatMaster® 35TC HeatMaster® 85TC
Fuel Natural Gas LPG Natural Gas LPG
Input max/min kW 34.9/10.0 30.6/10.0 85.0/17.2 85.0/17.2
Output max/min kW 34.1/9.8 29.9/9.8 82.5/16.5 82.5/16.5
Efficiency hot water mode % 105.9 105.9 103.9 103.9
Efficiency heating mode (30% load EN677) % 108.5 108.5 107.8 107.8
Seasonal efficiency % 96.2* 99.77* 96.4* 99.03*
NOx Rating (EN483)
mg/kWh
28.0 72/31 35.0 85/27
Total capacity L 189 189 315 315
Primary capacity L 108.5 108.5 125 125
Gas connection (male) Ø
3/4"3/4"3/4"3/4"
Primary flow & return connection (female) Ø1
"
1
"
1
1/2"
1
1/2"
Secondary hot water Connection (male) Ø1
"
1
"
1
"
1
"
Flue connection Ø mm 80/125 80/125 100/150 100/150
Max length concentric flue mtr 20 20 8 8
Nox class (EN483) class 5 class 5 class 5 class 5
Weight empty kg 174 174 284 284
Natural gas flow rate - 20mbar m3/h 3.7 - 8.99 -
Pressure drop mbar 30 30 200 200
Maximum operating temperature °C 90 90 90 90
Maximum operating pressure Primary: 3 bar Secondary: 10 bar *Seasonal Efficiency Building Regs. L2A & L2B: Section 2.4 equation 2.
HeatMaster® 35TC HeatMaster® 85TC
Litres in first 10 minutes 40°C 472 868
Litres in first 10 minutes 45°C 389 718
Litres in first 10 minutes 60°C 243 413
Litres in first hour 40°C 1322 3076
Litres in first hour 45°C 1116 2513
Litres in first hour 60°C 731 1594
Continuous flow 40°C Ltrs/hr 1070 2713
Continuous flow 45°C Ltrs/hr 917 2325
Continuous flow 60°C Ltrs/hr 642 1617
Please Note: Performance ata assumes a primary flow temperature of 90°C an a omestic col water supply of 10°C
Performance Data
HeatMaster® 35 C-85 C
otal condensing storage
combination boiler -
Sedbuk A rated.
With the high levels of building insulation now in place in most
properties, the requirements for heating output are reducing – this
trend is set to continue with some experts predicting a drop in the
boiler load due to heating from around 75% to as low as 45%. At the
same time, hot water usage is increasing year-by-year as demand rises
for luxury bathing facilities such as high performance showers and spa
baths. If hot water demand has risen to 55% of the boiler load, the
natural progression is to gain as much efficiency in hot water mode as
possible.
The HeatMaster TC can also be used as a stand alone water heater.
MCBA electronic control fitted as standard. Managing boiler and
burner functions, this helps reduce the stop/start cycle significantly,
ultimately saving fuel and component wear and tear.
Additional controls available, please discuss your requirements with
our technical department.
High efficiency condensing combination boilers
14
Heatmaster Heatmaster
35 TC 85TC
A1720mm 2145mm
B600mm 690m
C500mm 580mm
D80mm 100mm
E125mm 150mm
F140mm 160mm
G1700mm 2095mm
H670mm 725mm
I110mm 125mm
J100mm 105mm
K200mm 270mm
960mm 1210mm
M170mm 235mm
N230mm 240mm
Hot water outlet
Gas connection
Heating flow
Heating return
Cold water inlet
How does it work?
Heating
The heating return enters the lower
circuit of the boiler, which allows the
boiler to operate in condensing mode.
The upper circuit of the HeatMaster TC
is kept at a consistently high
temperature due to the internal shunt
pump which ensures that the primary
water circulates around the heat
exchanger flue tubes.
Hot Water
With the upper circuit maintained at a
high temperature, the HeatMaster TC
is always ready to supply hot water on
demand. The cold water enters
through the dome at the base of the
heat exchanger and is pre-heated
before entering the hot water tank.
The low temperature of the bottom
circuit results in continuous
condensation of the flue gases in hot
water mode.
Heating and Hot Water
Once up to temperature, the
HeatMaster TC is capable of producing
heating and hot water simultaneously.
Dimensions
