I have a Myson Velaire oil boiler which appears to be working fine, as does the heating, however, water from the expansion tank is disappearing at a rate of a tank every 2 days. Normally the water in the tank is 'topped up' once a year, now I am topping it up every other day. I have checked for leaks in the rads, there is no sign of water or damp in the house, I am at a loss as to why my system is using so much water. The Grundfoss pump was replaced 2 months ago, 3 rads were taken off when we redecorated. Apart from air in the system, which was dealt with, all appeared to be OK. I would appreciate any ideas or advice on this.
Expansion tank!
- Thread starter Lewis C
- Start date
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How old is your HW cylinder? There could be a leak in the coil which will allow water out of the header tank and into the HW supply which then gets rid of it through the taps. I take it it is a manual top up rather than a ballcock .
If you have an indirect cylinder and your f&e tank is higher than your cold feed tank it may be that the heat exchanger coil is leaking in the cylinder and you are drawing it off before it overflows. Wonder why you are manually filling your f&e tank?...does it not have a ballvalve?. Try not drawing any hot water and seeing if the level of your cold water storage tank is rising as your f&e tank level is falling. Mind you if you have chemicals in your header tank I would be tempted not to use the hot water at all until you got it sorted!
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breezer
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oilman said:
Thanks for your prompt response. My cylinder was replaced 2 years ago, I have a manual top up tank. When my house was renovated the plumber told me I couldn't have a direct water feed to the tank. If there is a leak in the coil can this be 'fixed' without having to replace the HW cylinder?
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