Posted by Danny Panesar on July 19, 2000 at 13:57:44:
In Reply to: Determining what size boiler we need. posted by Donna on July 11, 2000 at 17:55:24:
: We need help. We need to replace the 50 year old boiler in our house. Research tells us that the Burnham Independance is the most efficient on the market. We hired a plumber to come in to tell us what size boiler we needed. He preceded to calculate the size by using the heat loss calculation - all info. we found says steam is the only form of heat that you do not use this calculation on. How do we tell for sure what size boiler we need? We are at our wits end.
One way is to replace like for like; if your boiler is 20kWatt, then have similar size installed. Work out the heatloss for each room plus 10%. But even this is irrelevant as combi boiler (if that is your choice of boiler) is to be fitted, a lot of them are flame modulating i.e. they self adjust to load. If you are looking for effieciency you could go for condensing boiler- these are about 95% efficient. But you need to have a reduced flow temperature to take advantage of this efficiency- result bigger radiators and expensive and highly technical boiler. Suggest you look at a good boiler and install multi zones that are independently controlled to keep running costs down. You could event have each radiator fitted with electrically controlled valve for ultimate control. TRV do not have feedback to boiler to tell it to shut down when comfort level achieved
Post a Followup