As and when the gas regs change for new domestic bolier Installaions, I would opt for a change out of the existing natural gas boiler and select the hydro 20% mix boiler if it ever gets provided through the grid system?? A new boiler would be provided with normally a 5 or even 7 year warranty if the Boiler is registered with the manufacturers. Just remember to use a Gas Safe registered Eng for any gas works, this can be checked on the Gas Safe web site.
I wouldn’t consider changing for many years, as the manufacturers will have to maintain a source of spares for many many years on conventional natural gas boilers, but don,t consider a heat pump, high capital cost along with repairs and poor performance on traditional radiator systems; I’m more concerened about which new pole to buy

