Was this just done as cost cutting by the builders or something that was specified at purchase? Our boiler is 30kw for a two storey large 3 bed. Normally up to temp in a hour max and this is running on the eco setting.
Presumably cost cutting by the builder. It wasn't an option offered when I bought. To be honest, it's fine. Running a 30kW boiler for an hour is going to be similar to running a 12kW for 2.5 hours in terms of actual cost.
[Edit] Edit to add, it's a conventional condensing boiler, not a combi. It does make a bit of difference as combi boilers are usually spec'd much higher
Last edited: