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Duet
Dimensions
Cabinet Height |
840mm |
Cabinet Width |
450mm |
Cabinet Depth |
300mm |
Pre-plumbed, pre-wired and pre-assembled, the Duet from Keston really does take the headache out of finding the perfect boiler solution.
When installation time for heating systems is tight, the Keston Duet provides the answer. The Keston Duet combines the Keston Q28S modulating condensing boiler with the unvented qSpa water storage cylinder in one compact, ready-to-install unit, all contained in a pre-assembled, pre-plumbed and pre-wired floor-standing rig.
The Keston Duet is pre-assembled at our factory and fully tested prior to shipment. Built to a high equipment specification, it meets the demanding Chess HR2 recommended Best Practice system specification. The Duet offers a complete plug-and-play solution; simply locate, add power and water and a room thermostat of the customer choice. In addition, for multiple installations, Keston is able to modify the design to provide a bespoke solution to meet any customer needs. This can involve additional equipment as well as alternative product combinations from the Keston range.
Heating Features
-
Q28S gas condensing system boiler
-
System filling loop
-
8-12 litre heating expansion vessel
-
Automatic bypass valve
-
Three-bar sealed system safety valve
-
22mm two-port heating valve
-
Flow and return isolation valves
Hot Water Features
-
qSpa stainless steel unvented hot water cylinder
-
22mm two-port hot water valve
-
Potable water expansion vessel
-
Cylinder thermostat/overheat control
-
3kW immersion heater
-
CWS pressure reducing valve set
-
CWS expansion relief valve
-
Potable discharge tundish
Electrical Features
-
Wiring centre
-
Two channel programmer
-
Switched fused spur
Performance Data (Q28S – Natural Gas & Q28S – LPG) |
Unit |
NG |
LPG |
|
Max. CH input (Gross CV) |
kW |
297.4 |
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 |
|
Min. 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 |
|
|
m3/hr |
2.74 |
1.26 |
|
|
Max. operating flow temp |
ºC |
82 |
82 |
Technical Specification |
Unit |
qSpa 120 |
qSpa 150 |
qSpa 210 |
|
Capacity |
Litres |
120 |
150 |
210 |
|
Normal Size |
mm |
906 x 550 |
109 x 550 |
1489 x 550 |
|
Weight (Full) |
kg |
155 |
190 |
260 |
|
Application |
1 standard bath |
1 Bath and En-suite |
2 Bath |
|
|
Heat-up Time 15-65ºC |
mins* |
23 |
25 |
35 |
|
Re-heat Time |
mins** |
17 |
17 |
17 |
|
No. of Coils |
1 |
1 |
1 |
|
|
No. of 3kW immersion heaters |
1 |
1 |
1 |
NB: Figures are for guidance only and are based on BS6700 recommendations.
*Heat up from 15 to 65ºC with constant 82ºC coil flow temperature.
**Reheat times after 70% of tank is drawn off and replaced with 15ºC water.
All units are complete with 30-70 adjustable thermostat. qSPA twin figures
assume both coils used concurrently.