Sealed Heating System (with unvented hot water tank)

[Possom]

If a sealed heating system (with unvented hot water tank) is put in place can:

a) either plastic or copper pipework be used?
b) since system is "sealed" does this make it more complicated than it would be otherwise to either remove/replace a radiator to the system in the future?

Thanks.

 

[oldbuffer]

1. Copper or plastic can be used, except that:
1.1 Most boiler manufacturers specify copper for at least one metre from the boiler.
1.2 It used to be that plastic piping could not be used for domestic hot water with a secondary circulation system. Check with manufacturer of pipe and fittings.
2. It is generally easier to change a radiator in a sealed system than in a vented system. In either you create a partial vacuum in the system:
2.1 By "bunging" the F&E tank for a vented system.
2.2 By depressurising a sealed system.
2.3 In either case you need to be sure that there are no significant air leaks, and work quickly to cap pipes / reconnect valves.

 

[Possom]

1. Copper or plastic can be used, except that:
1.1 Most boiler manufacturers specify copper for at least one metre from the boiler.
1.2 It used to be that plastic piping could not be used for domestic hot water with a secondary circulation system. Check with manufacturer of pipe and fittings.

Thanks for that. I'm not a plumber so I'd just assumed all the pipework would all have to be copper in a sealed system. Interesting that certain pipe/fittings manufacturers may produce plastic pipes/fittings that can be used in a sealed system.

 

[fixitflav]

I'd just assumed all the pipework would all have to be copper

Seems it doesn't have to be, but it would be a better job IMO.