Are large Kw boilers inefficient if not working flat out?
The reason I ask is that a plumber said I should avoid getting an over powerful boiler becuase it would be inefficient - Is this true?
I currently have a Potterton Kingfisher RS80 rated up to 23Kw and it really struggles in the depth of winter.
I'm also having all my rads and pipework replaced and was thinking of a Greenstar 40CDi rated up to 40Kw. If it wasnt running flat out would I loose out?
Its a 3 storey 4/5 bed house with 17 rads.
The reason I ask is that a plumber said I should avoid getting an over powerful boiler becuase it would be inefficient - Is this true?
I currently have a Potterton Kingfisher RS80 rated up to 23Kw and it really struggles in the depth of winter.
I'm also having all my rads and pipework replaced and was thinking of a Greenstar 40CDi rated up to 40Kw. If it wasnt running flat out would I loose out?
Its a 3 storey 4/5 bed house with 17 rads.