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I'd recommend an Plumbing and heating engineer.
Discuss Expansion tank is it big enough. in the Plumbing Jobs | The Job-board area at PlumbersForums.net
Now I have some 22 rads and what with a run to and from the boiler I recon there is roughly about 300 litres in the system.
No tanks am looking at are for gravity fed system.Are we not at apples and pears here. Assuming the expansion tank in the loft is for a vented gravity system and the tanks he is looking at are pressure vessels for an unvented sealed system ? although i dont have any trouble sizing vessels in small increments here
Did actually think of that still a possibility.Twin 18ltrs.
So are you trying to convert the system or trying to keep it as a gravity fed?No tanks am looking at are for gravity fed system.
I think I am not too far of the volume. Worked it out by radaiator size and then adding volume in pipework. The boiler is some 15m plus away from the house and feed and return are in 32mm plus there is a fair bit of 28mm and 22mm knocking about soon adds up. Old expansion tank was I reckon a good 100 litres minimum has been at the tip for weeks so no chance of looking at levels.That seems rather a lot. Between two and three times what I'd expect for a domestic system. DId you measure it by counting buckets when you drained it?
How big was the old expansion tank? If you look carefully inside it you can probably see the high-water and low-water levels represented by rings of crud and corrosion.
Keeping as gravity fed.So are you trying to convert the system or trying to keep it as a gravity fed?
I think I am not too far of the volume. Worked it out by radaiator size and then adding volume in pipework. The boiler is some 15m plus away from the house and feed and return are in 32mm plus there is a fair bit of 28mm and 22mm knocking about soon adds up. Old expansion tank was I reckon a good 100 litres minimum has been at the tip for weeks so no chance of looking at levels.
Reply to Expansion tank is it big enough. in the Plumbing Jobs | The Job-board area at PlumbersForums.net
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