Converting One Pipe Heating System Ready For New Worcester 8000 Combi

[DavidWR197]

Dear DIYnot Plumbers

We recently moved into a 1950's bungalow that currently has a 1 pipe heating system (Heat Only Boiler at least 17 years old) with a gravity fed water cylinder in the bathroom - This needs removing as it's taking up valuable space in the bathroom.

The current system is in the crawl space of the bungalow (Great access) and has 1 inch copper pipe leading to 22mm copper and 15mm copper going to the radiators.
I've drawn a rough sketch of the current system (See below)

We want to replace this for a Worcester 8000 Combi Boiler BUT currently only have the 1 pipe system which is not ideal for the combi.

My question is:
What solutions are available for turning the current 1 pipe system into a 2 pipe system and what materials would you use as a plumber?

Thank you for taking the time to answer this query
Kind Regards
David

 

[cross thread]

I would repipe completely ,I am old school and prefer copper but if doing yourself speed fit is a easy option,have new rads correctly sized for running at a lower temperature to keep your boiler in condensing mode as much as possible.

 

[DavidWR197]

I would repipe completely ,I am old school and prefer copper but if doing yourself speed fit is a easy option,have new rads correctly sized for running at a lower temperature to keep your boiler in condensing mode as much as possible.

Thanks for getting back to me on this. Working on the BTU's and new rads right now and I'd prefer copper too - Many Thanks David