had a couple of quotes for replacing an existing vented CH System S plan, going to pressurised system (not hot water ) either WB or Vaillent. 15kw. (system boiler or heat only.
last quote said that 15mm gas feed is OK so long as there is 16.5 operating pressure, is that correct figure please? no other gas appliances in the property (flat).
thanks
last quote said that 15mm gas feed is OK so long as there is 16.5 operating pressure, is that correct figure please? no other gas appliances in the property (flat).
thanks