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What is this small White Vessel next to Worcester Boiler?
FrankFalcon
Posts: 281 Forumite
Hi all
My daughter has just got her first house. We had a tour round the house last night and saw this (small White
cylindrical vessel) at the side of the boiler (Worcester Greenstar i). What is this please? What is the purpose of this? Is it actually in use given that the boiler is surely a combi?
My daughter has just got her first house. We had a tour round the house last night and saw this (small White
cylindrical vessel) at the side of the boiler (Worcester Greenstar i). What is this please? What is the purpose of this? Is it actually in use given that the boiler is surely a combi?Thanks in advance.
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Thank you. For the reply. I understand it now. It’s just that I’ve never seen one with a combi previously. All makes sense now.Cheers0
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Are you sure it is a combi boiler ?Most (all ?) expansion vessels for a combi boiler are internal as are a lot of system & heat only boilers. If there is an unvented DHW cylinder, that would explain an external EV.Any language construct that forces such insanity in this case should be abandoned without regrets. –
Erik Aronesty, 2014
Treasure the moments that you have. Savour them for as long as you can for they will never come back again.0 -
Looks like a combi. Has a HW expansion vessel and TF1 on the return. This is an educated guess as you can’t see the other 2 pipes. A white expansion vessel is for potable water, the ones built into a boiler will be for heating. Possibly had an unvented tank before as there is a reducing set and PRV on the cold feed.FreeBear said:Are you sure it is a combi boiler ?Most (all ?) expansion vessels for a combi boiler are internal as are a lot of system & heat only boilers. If there is an unvented DHW cylinder, that would explain an external EV.1 -
It's connected to a pressure release valve, so must be an expansion vessel for some purpose. Yes, that boiler (if combi) should have one inside it, but perhaps it's failed?FrankF, any idea where these chrome pipes go to - could you trace them and report back?0
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It's not uncommon for replacement expansion vessels to be placed outside the boiler.
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On older WB boilers, the expansion vessel slid upwards out of the back which made it a nightmare to replace. When ours failed, I replaced it with an external expansion vessel as the only other option was to remove the boiler from the wall to get to the EV.1
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It's also not uncommon for an additional expansion vessel to be needed, as the integral expansion vessels in combi boilers are normally only sized for small flats.
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But this is a potable water expansion vessel on the cold feed. Not part of the heating system. It would be red and normally on the boiler return if part of the heating system.0
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What's the difference between the two types, I wonder? Apart from colour...
The white one uses non-toxic materials, I guess? But could it otherwise be used on a 'system'?0
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