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Indirect Unvented cylinder, Combi Boiler and Nest Thermostat

Discuss Indirect Unvented cylinder, Combi Boiler and Nest Thermostat in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Bibbs118 said:
Being told something is not the same has following the MIs, what am saying is, if you can't get a drawing then it's not ok .

Because it's impossible to follow MIs without having the MIs .
Click to expand...
If the manufacture say it is ok. And they warrant the job for 10 years then it is ok. But for future reference I will make sure they email me confirmation.:p:p On that not I’m done. I will not be commenting again.
 
Harvest Fields said:
If the manufacture say it is ok. And they warrant the job for 10 years then it is ok. But for future reference I will make sure they email me confirmation.:p:p On that not I’m done. I will not be commenting again.
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That's totally correct, you need confirmation.
 
Can worcester authorise one of their own products ?
Of course they can .
A worcester was fitted on such set up and fitted and authorised along with guarantee themselves.

Job done money in the bank and all happy
 
hammers4spanner said:
Can worcester authorise one of their own products ?
Of course they can .
A worcester was fitted on such set up and fitted and authorised along with guarantee themselves.

Job done money in the bank and all happy
Click to expand...


That ok, am not saying it can't be done, am saying the poster needs a drawing, if no drawing is available then it's not permitted .

And saying I've seen it done loads of times does not mean it's right, I've seen loads of flue not clipped but that doesn't mean it's right .
 
You don't need a drawing / tech schematics

Doesn't mean it's unsafe or manufacturer arnt going to warrenty there boiler

Hell even if you fit the unvented incorrectly I'm sure they would still warrenty there boiler
 
ShaunCorbs said:
You don't need a drawing / tech schematics

Doesn't mean it's unsafe or manufacturer arnt going to warrenty there boiler

Hell even if you fit the unvented incorrectly I'm sure they would still warrenty there boiler
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So what your saying you DONT need to install to manufacturers instructions? Interesting.
 
ShaunCorbs said:
More like common sense
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The as long as you use common sense you don't have to follow MIs?


What if your common sense differs from my common sense. Because my common sense says always and without exception install to MIs, but you your common sense says something different
 
Last edited:
I am not gas qualified, so won’t comment on anything gas.
The unvented cylinder will be to regs if heated by a controlled heat source of oil or gas boiler and the 2 port valve supplied with the unvented unit to be in operation, controlled by uv stat.
A combi used with extra zone, or solely a zone for unvented or vented cylinder hot water I would have thought was fine and to MIS.
The space heating main body part of a combi boiler is just the same as a heat only system boiler anyhow, - isn’t it?
But sure it only takes a phone call or email to the boiler manufacturer to confirm.
I know combi boilers are installed on homes where there is some sort of hot water cylinder (vented or not) so to give option of mains pressure hot water at some outlets, or to provide instant hot water at a supply close to where the gas boiler is sited, - like a kitchen tap.
 
So many posts on here now, hard to keep up and on topic.
Does this mean it should or should not take 40seconds to get hot water from the taps?
 
Something that is always over looked on these installs is if the dhw draw off from the combi is to a frequency used hot tap, the boiler sits in anti cycle for 5 mins every time the flow turbine moves, meaning it can take hours to heat the cylinder.
 
As requested, Pictures from the cylinder. Seems the hot feed from the top of the cylinder is branched off - 1. Specifically to the upstairs bathrooms x 2 (1st floor and loft).
2. The rest of the house

20180425_182046.jpg


20180425_181957.jpg
 
Who lagged the discharge pipes?
Also I would get that plastic push fit stopend replaced with a brass compression stopend
 
Wonder if they wore a wool shirt too...:eek: Who the hell puts that rubbish on. Especially in a cold space like a basement...
 
Any pictures of under the boiler, 2 port valves etc around the cylinder

It is insulated, not they way most would do it but I don't think it specifies anywhere what standard if insulation must be used?
 
It's about appropriateness. If that space get s down around freezing then it needs better protection.
If however it's to protect against rodents, then that works brilliantly as they don't like the fibrous nature of it and leave it alone... Instead they use the polyplumb elbows to sharpen their teeth :D
 
scott_d said:
Any pictures of under the boiler, 2 port valves etc around the cylinder

It is insulated, not they way most would do it but I don't think it specifies anywhere what standard if insulation must be used?
Click to expand...

Unfortunately not, as the pipes from the cylinder are all under the panel that has been fixed back to the cupboard.

The location of the boiler is within the kitchen.

I believe there is a 3 port valve, 2 of the ports are for underfloor heating within the kitchen/diner area.
 
YorkshireDave said:
It's about appropriateness. If that space get s down around freezing then it needs better protection.
If however it's to protect against rodents, then that works brilliantly as they don't like the fibrous nature of it and leave it alone... Instead they use the polyplumb elbows to sharpen their teeth :D
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Never gets below around 15 degrees
 
I am surprised if MIs state just 28 minutes for that cylinder reheat.??? I would have thought it is much more.
The hot water outlet on unvented cylinders I prefer to drop the pipe before ever raising the pipe to a higher level. Just raising a hot outlet will mean some of the stored heat from the cylinder will keep heating the water in the raised pipe, therefore wasting energy.
 
Best said:
I am surprised if MIs state just 28 minutes for that cylinder reheat.??? I would have thought it is much more.
The hot water outlet on unvented cylinders I prefer to drop the pipe before ever raising the pipe to a higher level. Just raising a hot outlet will mean some of the stored heat from the cylinder will keep heating the water in the raised pipe, therefore wasting energy.
Click to expand...

20kw going into the coil will re heat in around 30 mins
 
That's the direct on have a look at the indirect spec
 
35 minutes for full reheat, is what I read on 250l indirect.
Not bad, if that's correct.
I have one installed isn't achieving that
 
Best said:
35 minutes for full reheat, is what I read on 250l indirect.
Not bad, if that's correct.
I have one installed isn't achieving that
Click to expand...

Size of boiler ?
 
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