Just looking to spec a new boiler -
1910 solid brick 3 story (built like that) semi about 250m2 insulation being installed betwene floors and in roof space as renovation progresses (no insulation currenty!). All good sized rooms (benefit of old build!)
2 reception rooms
kitchen
hall
5beds over two floors,
en suite bathroom with shower (used 4x daily)
family bathroom (bath used daily)
Happy to calculate heat loss for boiler size but how do I allow for unvented cylinder?
megaflo, santon, OSO all seem to have 20kw coils.
Telford has 16kw but can be doubled to 32kw high gain coil to reduce reheat time.
If I spec a boiler for the heating and add on the DHW coil I get a HUGE boiler that'll be totally inefficient in the summer, surely??
Could two smaller boilers be cheaper in the long run? one for DHW and one for heating, or do I just assume that the unvented cylinder will not really impact on the heating requriement as it'll be short bursts??
Any help greatly appreciated.
1910 solid brick 3 story (built like that) semi about 250m2 insulation being installed betwene floors and in roof space as renovation progresses (no insulation currenty!). All good sized rooms (benefit of old build!)
2 reception rooms
kitchen
hall
5beds over two floors,
en suite bathroom with shower (used 4x daily)
family bathroom (bath used daily)
Happy to calculate heat loss for boiler size but how do I allow for unvented cylinder?
megaflo, santon, OSO all seem to have 20kw coils.
Telford has 16kw but can be doubled to 32kw high gain coil to reduce reheat time.
If I spec a boiler for the heating and add on the DHW coil I get a HUGE boiler that'll be totally inefficient in the summer, surely??
Could two smaller boilers be cheaper in the long run? one for DHW and one for heating, or do I just assume that the unvented cylinder will not really impact on the heating requriement as it'll be short bursts??
Any help greatly appreciated.