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Q28S
Dimensions
Cabinet Height |
840mm |
Cabinet Width |
450mm |
Cabinet Depth |
300mm |
Designed to make domestic sealed system installations easy.
This fully modulating gas condensing boiler features advanced integral controls that provide a suite of options to ensure optimum performance is delivered to your customer at all times. For total control, the Q28S also features an integral speed-controlled pump to ensure water flow rates and burner rates are perfectly matched.
The Keston Q28S has all the cost and energy-saving benefits of condensing technology, combined with a speedy, uncomplicated and straightforward installation. With dimensions of H700 x W435 x D280 and a weight of just 43kg, the Q28S has can be sited virtually anywhere. With no compartment ventilation required, it can even beinstalled in a standard kitchen cupboard*.
*Please check cupboard size prior to installation
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High efficiency
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Simple LCD user display indicating full product operation status at all times
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No compartment ventilation due to the very low casing temperatures
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Full diagnostics and information display
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Fully programmable setting – can be tailored to each individual users needs
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Two stage frost protection
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Flexible fluing options
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Built-in frost protection
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Available in natural gas and LPG versions
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Weather compensation as standard
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Two year parts and labour warranty
Performance Data |
Unit |
NG |
LPG |
|
Max. CH input (Gross CV ) |
kW |
29.4 |
27.8 |
|
Max. DHW input (Gross CV ) |
kW |
N/A |
N/A |
|
Max. DHW output to water |
kW |
N/A |
N/A |
|
Max. DHW output to water (80/60ºC flow/return) |
kW |
26.4 |
26.4 |
|
Max. output to water (50/30ºC flow/return) |
kW |
28.4 |
28.4 |
|
M in. output to water (80/60 flow/return |
kW |
7.0 |
7.0 |
|
Max. domestic water flow rate (at 35ºC rise) |
l/min |
N/A |
N/A |
|
Specific DHW rate (EN625 30ºC rise) |
l/min |
N/A |
N/A |
|
Max. domestic hot water flow temp |
ºC |
N/A |
N/A |
|
Max. Gas Cons. After 10 mins |
l/s |
0.76 |
0.35 |
|
Ft3/hr |
96.62 |
44.50 |
|
|
Ft3/hr |
2.74 |
1.26 |
|
|
Max. operating flow temp |
ºC |
82 |
82 |
Installation Data |
Unit |
NG |
LPG |
|
Max. Press (sealed system) |
bar |
2.5 |
2.5 |
|
Inlet Gas Pressure |
mbar/(in w.g) |
20.0 |
20.0 |
|
Electrical supply |
230V 50Hz |
230V 50Hz |
|
|
Power consumption (max) |
W |
150 |
150 |
|
Power consumption (standby) |
W |
8.5 |
8.5 |
|
Optimum flue gas CO2 level (at max CH rate, case on) |
% |
9.1 |
10.5 |
|
SEDBUK efficiency |
91.1(A) |
93.1(A) |
|
|
NOx Class |
5 |
5 |
|
|
Safety valve |
bar/(ibf/sq in) |
3/(43.5) |
3/(43.5) |
|
Expansion vessel capacity |
litre |
8 |
8 |
|
Expansion vessel charge pressure |
bar/(ibf/sq in) |
1.0 (14.5) |
1.0 (14.5) |
|
DHW Max. Work ing Pressure |
bar/(ibf/sq in) |
N/A |
N/A |
|
GC Number |
41-930-17 |
41-930-18 |
|
|
CE PI Number |
87BR36 |
87BR36 |
|
Physical Data |
Q28S |
||
|
Weight – full |
kg/(lbs) |
47 (104) |
|
| Weight – empty | kg/(lbs) | 43 (95) | |
|
Flow and return connection |
G3/4 |
||
| DHW and CWS connection |
N/A |
||
| Gas connection |
G 1/2 |
||
|
Condensate connection |
22mm plastic | ||
|
Safety valve discharge connection |
15mm copper |
||
|
IP rating |
IP20 (IPX0) |
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Flue and air intake material: 50mm PVC |
|||
|
Max. Flue outlet length |
m |
20 |
|
|
Max. Total flue outlet and air intake |
m |
40 |
|
Flue and air intake material: 75mm composite flue |
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|
Max. Flue outlet length |
m |
60 |
|
|
Max. Total flue outlet and air intake length |
m |
120 |