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I'll shortly be having a new boiler installed (probably Glow Worm Ultracom 18hxi or Vaillant Eco Tec Plus 418), together with controls and pump. 3 zones - downstairs, upstairs & HW. Probably going to stay with my existing conventional vented indirect HW cylinder. For now at least. I'm...

How does a modern low-water-content condensing boiler cope with a power cut? It's not possible for the pump to run on in order to dissapate heat - so should I expect likely need for heat exchanger replacement every time there's a power cut when the boiler is at full tilt?

I'm having a new boiler installed to replace my exceedingly reliable Potterton Netaheat 16/22. I've been offered this: Glow Worm Ultracom 18HXI or Vaillant Ecotec Plus 418 (+£360) Grundfos 15-60 high head pump S plan, autobypass valve Magnaclean Power flush Honeywell cylinder stat...

I am installing 2 radiators in a room and am looking at creating a zone to control these - using a 2 port motorised valve, adjustable restrictor valve to balance this circuit against the rest of the heating installation, and a room thermostat. The motivation is to be able to mount the radiators...

My current loft insulation is 40mm solid polystyrene fitted between the joists. I'm about to lay Rockwool - about 270mm - and am wondering whether to lay on top of the polysturene or discard polystyrene. If I discard the polystyrene I remove a fire risk. If I lay on top I'll get better...