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Glass lined Cylinder for private water supply

 
Air Source Heat Pumps (ASHPs)
Last Post by ian33a 55 minutes ago
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 ian33a
(@ian33a)
Eminent Member Member
Joined: 4 years ago
Posts: 31
Topic starter 29/08/2026 12:57 pm   [#3147]

My journey toward a heat pump continues, albeit slowly:

For those who are aware of my past dealings with installers, a quick update first -

After having been, I'd say, strung along, for over a month, an installer who came across well, when nudged, gave us a quote which was more than twice what I expected and was immediately rejected. I wasn't impressed as it was time totally wasted and we are quickly moving toward the autumnal months.

 

Anyway, a couple more installers have been out and I await their heat loss surveys and quotes. Both though, because I have been upfront, have expressed concerns about the fact that we get our water from a bore hole.

I remember Aira turning us down flatly because of this a few months ago and I respect the fact that some cylinder manufacturers don't want the risk of private water supplies destroying tanks. We do have basic water treatment, but it is basic and my wife and I haven't died just yet from water poisoning and, in all honesty, don't have the wish or the space to install a chemical plant which would make an Ineos engineer proud.

 

We are being told that many hot water cylinder manufacturers will not guarantee their tanks unless it can be proven that water going through them remains PH neutral and chemical free or that it only comes from a public supply. Consequently, we risk sitting on a leaking time bomb - or potentially so.

There is, we're told, an alternative glass lined tank but I am struggling to find the sort of thing that is being described (as quotes are still awaited) . I've been told that glass lined tanks come with about a £1000 surcharge.

I suspect our house will need a 300 litre tank, or thereabouts, and one of the installers is considering a Vaillant 12KW unit as the heat pump.

Have any of you been down the glass lined discussion with installers ? Did you go glass lined or just stay stainless steel and keep your fingers crossed?

thanks

 



   
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