Draining a sealed system and adding a rad

Postby greengrass » Wed Jun 27, 2007 7:21 pm

My daughter and family have moved in to a chalet bungalow and one upstairs bedroom lacks a radiator.
My son in law wants help adding the rad. He can't find a header tank only the main tank in the loft so assumes it’s a sealed system.........They have a hot water tank in the airing cupboard if that makes a difference to the type of system.
I know we can close all rad valves and just drain the pipes but I fear that some of the valves might not shut the water in the rads off [not temp controled type valves].

1. If a sealed system where would the top up bottle be located, and do we turn off the mains feed in to the property/ or the bottle stop valve if fitted, to stop the bottle/boiler being topped up when draining starts?

2. Are push fit joints suitable for central heating?

3. What’s the knack in getting the Tee joints in the flow pipes if they don't move enough?

4. As the addition is upstairs do we need to drain the whole system?
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