Combi Boiler for Heat Only

[JamieG]

Hi, just looking for a bit of advice on how you would plumb a combi for a heat only system. Hot water currently fed off the Aga cooker, looking at a combi for price/value/ease as opposed to a Heat only.

 

[ShaunCorbs]

you need one draw off eg one hot tap

 

[jtsplumbing]

What sort of gas will it be running on, ? you will need min one tap to draw hot water, Intergas is a good bet, if running on LPG

 

[Daniel Hall]

New glow worm combis have a heating only function

 

[Harvest Fields]

New glow worm combis have a heating only function

That means Vaillant will have soon then.

 

[Daniel Hall]

Im still a bit sceptical of glow worm but they're offering 10 year warranties so must be better than they were.

 

[Harvest Fields]

Im still a bit sceptical of glow worm but they're offering 10 year warranties so must be better than they were.

With a huge get out close. I heard that the first thing they do is a water test.

 

[Daniel Hall]

That will be my gaffers problem. Its not a hard water area, system cleaned and a magnaclean/inhibitor used. They will get out of it if they really want to. Some warranties aren't worth the paper theyre printed on.

 

[Last Plumber]

Hi, just looking for a bit of advice on how you would plumb a combi for a heat only system. Hot water currently fed off the Aga cooker, looking at a combi for price/value/ease as opposed to a Heat only.

Why not use a system Boiler?

 

[JamieG]

Why not use a system Boiler?

It’s an old cottage that already has a hot water system ran off the Aga and the bills are rediculously cheap and pipework all hidden so ideally don’t want to start creating a bigger job than what’s needed.
There’s no heating system and there’s only going to be 3-5 radiators installed with limited pipework so I’m my opinion makes sense to buy a combi because of the ease/cost compared to a heat only but needed to know what to do with the hot water feed because I’ve never been in a similar situation.

 

[Last Plumber]

It will be easier still as you don't need to worry about the domestic hot water side!
A system Boiler will probably be a similar price.

 

[Scott_D]

System boiler unless they have use for the hot from a combi

 

[Darren Jackson]

Combi boilers are generally dearer then combi's and require more work installing them. You are much better installing a system boiler.

 

[Harvest Fields]

Combi boilers are generally dearer then combi's and require more work installing them. You are much better installing a system boiler.

Do you mean heat only?

 

[Darren Jackson]

Do you mean heat only?

Yes a heat only System boiler, that way you don't have to bother with the cold feed & hot water side at all and just needs a filling loop anywhere it's convenient, condensate. blow off, gas and the CH pipes. Where As a regular heat only will require the F&E as well. And the combi needs all the above minus (F&E)+ a cold feed and hot water piped up to at least one tap.

 

[Scott_D]

I once went to do a job organised by someone else.
They had ordered a heat only system boiler.
A heat only boiler was needed and a system boiler was delivered. Who was wrong organiser or merchant?

 

[Last Plumber]

I once went to do a job organised by someone else.
They had ordered a heat only system boiler.
A heat only boiler was needed and a system boiler was delivered. Who was wrong organiser or merchant?

That hurts my head a bit!
I think your organiser wanted a regular boiler?
A system Boiler is heat only, just like a regular boiler.
Same job, less work, less thought, less skill required.
In My Opinion.

 

[quality]

I do prefer a traditional system as I am not a fan of combis at all even though we fit them. What I am sometimes cautious over is pressurizing old system pipe work when going from open bent to sealed with a system

 

[Yo8Gas]

With a huge get out close. I heard that the first thing they do is a water test.

The Vaillant group do, they do a Turbidity test,<even if you have fitted a magnetic filter on central heating return,scale reducer on cold inlet,powerflushed,cleaner and inhibitor ect to benchmark standards>and tell the costumer for example that the divertor valve<most common leak on all new combi boilers and all manufactures suffer this problem> is leaking because of poor central heating water quality.You then try and ask Vaillant where the water sample as been taken from they cant tell you!and they dont have a set procedure for taking a water sample.
Ideal and Baxi in my experience change the divertor valve no issues and dont slate the installers who have followed benchmark standards.

 

[Harvest Fields]

The Vaillant group do, they do a Turbidity test,<even if you have fitted a magnetic filter on central heating return,scale reducer on cold inlet,powerflushed,cleaner and inhibitor ect to benchmark standards>and tell the costumer for example that the divertor valve<most common leak on all new combi boilers and all manufactures suffer this problem> is leaking because of poor central heating water quality.You then try and ask Vaillant where the water sample as been taken from they cant tell you!and they dont have a set procedure for taking a water sample.
Ideal and Baxi in my experience change the divertor valve no issues and dont slate the installers who have followed benchmark standards.

Never had an issue Vaillant. They are awesome. However never really had to call them out.

 

[pendragon6667]

I have an Intergas rapid 32, hot water fed from a dual coil unvented cylinder, one coil on solar the other fed from my wood burner. Hot water from tank goes through the combi combi fires if its below 55 degrees. Also has a thermostic blending valve before the combi to ensure the water is no higher than 60 degrees going through the boiler. Intergas can be programmed for heat only system, vented or combi with parameter changes. Good boiler i fit loads, glow worm warranties are a joke.

 

[Yo8Gas]

Never had an issue Vaillant. They are awesome. However never really had to call them out.

only problem Ive had is divertor valves possibly 3 out of over 500, but Vaillant made it an issue so I dont fit anymore.