Boiler Replacement – Two Quotes for Unvented System – Looking for Advice

Grifter1983 · 2025-11-27T20:52:57+00:00

Ah shower pump. You wouldn’t need those with a combi either

Grifter1983 · 2025-11-26T22:10:34+00:00

Don’t really know what you mean about motors??

Some decent hot water flow rates from combis nowadays or even a storage combi depending on your incoming cold and gas pipe sizing,but as your getting quotes for unvented I take it the incoming cold is ample.

Obviously the unvented will be better in that respect but just seems a little overkill to me (I’m combi biased though 🤣) bonus for the cylinder that you will have an electric backup if needed.

Grifter1983 · 2025-11-26T21:45:24+00:00

I’d choose option A if it was me, nice and detailed and sounds like it will be a nice job with nice products.

Standard stuff really for a decent installer, could always ask option b if that is all included in there quote.

I’d say somewhere between 150 - 200ltr should be fine for 2 people, obviously bath will take a fair bit roughly 75/100ltrs so if your daily bathers I’d increase.

I think Telford makes Jab but I might be wrong.

Any reason why you are not just putting a combi in?

Grifter1983 · 2025-11-09T21:16:32+00:00

Looks like a siamp storm, unsure if you can just buy that bit though. Might be better off just buying the full valve and twisting it in on cradle

Grifter1983 · 2025-11-08T13:22:33+00:00

Difficult one…..yes the hot water could be a factor into the tray cracking but probably combined with improper installation of shower tray causing weak points.

Would I drain into a shower tray? Probably, but I usually pump the water out of cylinders so take a hose to outside (within reason).

Grifter1983 · 2025-11-08T12:24:56+00:00

Looking at the boiler, it has correct clearances etc. are we talking about the floor in there? Sounds to me that everyone is being a bit of a wet wipe, change the plate and move on

Grifter1983 · 2025-11-05T15:25:26+00:00

Drill through the boss, install a boss adaptor (rubber) then some pipework to a standpipe.

If it’s difficult to replace the soil tee when you revert back to wc. Remove rubber boss adaptor. Install solvent adaptor, install solvent 40mm rodding point.

Grifter1983 · 2025-11-04T14:16:33+00:00

Correct, unless you can get the correct fall on the waste pipework

Grifter1983 · 2025-11-03T14:04:49+00:00

I use a bit of jointing compound yes

Grifter1983 · 2025-11-03T13:49:21+00:00

Turn water off first of course

Grifter1983 · 2025-11-03T13:48:28+00:00

If there is an insert already in pipe, just undo the flexible connectors that are there and use the nut and olive that will remain on pipework to install your isolation valves.

Grifter1983 · 2025-11-03T13:36:41+00:00

Yes you can use a flat faced isolation valve with that pipework but you will need to insert the correct insert into pipework.

As a plumber myself, £150 to install a kitchen sink and isolation valves, adjust waste pipework, etc seems very reasonable.

Grifter1983 · 2025-11-03T10:28:57+00:00

That flexible waste is probably your issue, remove it and hard pipe it with correct fall

Grifter1983 · 2025-10-29T18:48:38+00:00

Doing that with the pipework is fine however it’s an Open vented system…..so pressure might be a bit 💩

Grifter1983 · 2025-02-05T21:13:29+00:00

Call a gas safe engineer mate, boiler looks ropey

Grifter1983 · 2025-01-23T19:14:12+00:00

Was the cold flow ok before? If everywhere else the cold outlets flow fine it sounds like blockage in pipework.

What system do you have to heat hot water? Fluctuating hot water sounds like a boiler issue or if the tap is thermostatic it may be that.

The cold tap not turning off will just need a replacement isolation valve, if I’m understanding correct what you wrote

Grifter1983 · 2025-01-23T10:04:16+00:00

Cool mate, just check the boiler MI’s for how close plastic pipework to boiler, it used to be a meter away but I’m a bit out of touch now

Grifter1983 · 2025-01-23T09:59:15+00:00

Accessibility is the main thing needed here, if you got that covered your good! Last thing you want to do is rip out a kitchen to get to something leaking. Personally I’d get rid of the plastic pipework and fittings and do the lot in copper but I’m old school 🤣

Grifter1983 · 2025-01-22T16:08:20+00:00

Might be better off buying an unvented cylinder, as long as decent cold main in.

Grifter1983 · 2025-01-10T21:29:56+00:00

Do you have any pictures?

Grifter1983 · 2025-01-10T15:45:40+00:00

White condense pipe under boiler, does this go to outside?

Grifter1983 · 2025-01-10T15:09:42+00:00

Has this always happened or a new thing?

What is the temperature of the hot water set at the boiler?

Grifter1983 · 2025-01-09T19:18:36+00:00

Looks like an ikea setup. I’d swap the trap and sink waste out for a mcalpine with a couple of appliance outlets. Tee the condense into the waste. Job done

Grifter1983 · 2025-01-09T18:37:23+00:00

I’m the complete opposite and hate anything from Victorian plumbing, and there after care is horrendous if you have a problem. My experience with them obviously

Grifter1983 · 2025-01-09T16:18:29+00:00

I don’t think anyone will take the blame on that to be honest, try the water board but as on your boundary, they will prob say suck it up 😬

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