hi, i have an open vent heat only system and the boiler is ready for a change,so was think about a sealed system,is this a big job,
1, do you have to change the hot water tank
2, what do you do with the pump in the airing cupboard
3, does it still need the 3 port vavle
4, will it need overflow capping off to header tank
thanks for your help
1, do you have to change the hot water tank
2, what do you do with the pump in the airing cupboard
3, does it still need the 3 port vavle
4, will it need overflow capping off to header tank
thanks for your help