radiators & capacity of back boiler

[izzy18]

We have a baxi bermuda 552 back boiler with we *think* is about 13-14 years old. It currently runs 6 radiators. we are planning a new singel extension and will need to add radiators ? 3-4 (need to clarify that!). will the boiler accomodate this ? the product info states that radiator capacity is 25.5 sq.m without domestic hot water and 23.2 sq.m with , dont know what this means though . the house is a standard 3 bed semi (approx 1959)

did think about getting a new boiler but the blokey that services did put me off and apart from a new pump and replcing a wire inside hasnt given us any trouble

 

[kevplumb]

info states that radiator capacity is 25.5 sq.m without domestic hot water and 23.2 sq.m with , dont know what this means

25.5 square metres of rads without having a hot water cylinder connected

23.2 if you have

 

[izzy18]

we do have a hot water cylinder connected, how many radiators does 23.2 sq.m equate to?
many thanks

 

[kevplumb]

measure the rads area = length x hight and add it up

 

[AlF2008]

I need to do this too.

Presumably you need to take account of whether they are single or double convector too. Is it simply multiply by 2 for a double?

 

[kevplumb]

yup