This might be easier to answer remotely than some of my previous questions??!!
I've decided to renew my boiler plus other works. Guy who quoted said off the top of his head (and based on experience) I need a 24KW Worcester Bosch regular boiler for CH and HW. W/B's own site has a rough calculator which gave 12KW (for 1-3 bedrooms) and a more detailed site actually gave similar answer. I'm in a "standard" 1930s 3-bed semi. (30' x 18' plan) although extended living room is now 18'x15', double-glazed throughout. There's not a great price difference for different outputs but I thought boilers were best when working hard? So, although boiler is modulating, is 24KW excessive and does it matter?? (I also read somewhere these boilers are set by default anyway to 15KW??).
I've decided to renew my boiler plus other works. Guy who quoted said off the top of his head (and based on experience) I need a 24KW Worcester Bosch regular boiler for CH and HW. W/B's own site has a rough calculator which gave 12KW (for 1-3 bedrooms) and a more detailed site actually gave similar answer. I'm in a "standard" 1930s 3-bed semi. (30' x 18' plan) although extended living room is now 18'x15', double-glazed throughout. There's not a great price difference for different outputs but I thought boilers were best when working hard? So, although boiler is modulating, is 24KW excessive and does it matter?? (I also read somewhere these boilers are set by default anyway to 15KW??).