Hi guys,
I'm trying to decide on what combi boiler to get and I have a couple of questions, wondered if you'd all be good enough to help!
1. What size boiler do I need?
EnergySavingTrust and Sedbuk says I need a 10kw boiler for my semi-detached house, however for combi boilers should I instead be looking at the DHW rating and make sure I get a boiler which modulates down to 10kw?
2. Should I get any extra capacity on the DHW rating?
The shower I'd like has a rating of 11 l/min, and my wife likes to have baths. Should we get as higher DHW as possible to cope with this?
The boilers I'm considering are below. The ATAG is currently my current "favourite" (highest DHW for lowest modulation). The Vaillants both cover either the higher DHW, or the modulation for the CH.
ATAG A325EC
DHW @dT35 - 15l/min
Modulation range CH kW - 6.1 to 30.9
Vaillant ecoTEC 831
DHW @dT35 - 12.7 l/min
Modulation range CH kw - 8.7 to 24
Vaillant ecoTEC 837
DHW @dT35 - 15.2 l/min
Modulation range CH kw - 12 to 28
Feel free to tell me if I'm barking up the wrong tree
Thanks for any help
I'm trying to decide on what combi boiler to get and I have a couple of questions, wondered if you'd all be good enough to help!
1. What size boiler do I need?
EnergySavingTrust and Sedbuk says I need a 10kw boiler for my semi-detached house, however for combi boilers should I instead be looking at the DHW rating and make sure I get a boiler which modulates down to 10kw?
2. Should I get any extra capacity on the DHW rating?
The shower I'd like has a rating of 11 l/min, and my wife likes to have baths. Should we get as higher DHW as possible to cope with this?
The boilers I'm considering are below. The ATAG is currently my current "favourite" (highest DHW for lowest modulation). The Vaillants both cover either the higher DHW, or the modulation for the CH.
ATAG A325EC
DHW @dT35 - 15l/min
Modulation range CH kW - 6.1 to 30.9
Vaillant ecoTEC 831
DHW @dT35 - 12.7 l/min
Modulation range CH kw - 8.7 to 24
Vaillant ecoTEC 837
DHW @dT35 - 15.2 l/min
Modulation range CH kw - 12 to 28
Feel free to tell me if I'm barking up the wrong tree
Thanks for any help