System boiler and UVC set up

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First I would want to know his dynamic water supply characteristics.

Then I would try encourage him to agree to fit a system more suited to the number of people who could often live in a house of that size.

That would probably be a 300 litre cylinder and a boiler matched to the heat loss of the property probably about 15 - 18 kW.

But every existing situation is unique and for example someone who is just retired and expects to live in the same house for the rest of their life which could be 40 years could sensibly argue for a smaller capacity cylinder.

On the other hand a developer potentially going to market the four bed house for large families would be better advised to fit a 300 li cylinder.

Tony
 
Your boiler is not greatly oversized but in many ways your cylinder is rather undersized.

Rather than saying my sizing methods are wrong, why don't you be positive and say what you consider to be correct?

But my sizing rules are based on what my friend used to teach at the South Bank University HVAC courses! Not just my personal views.
 
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If you can't work out why my, and must other professionals on the forum think your methods are bizarre /wrong then that's not my issue.

When was your "friend" teaching these methods?

Earlier this evening you were going on about the energy savings trust course, not a friend and hvac. You must be the only person I know that thought the energy course thing was worth more than bog roll. Even when I took the course I thought it out dated and riddled with errors.
 
Back to the OP the viessmann setup is my personal preference

The intergas setup is @Dan Robinson personal preference.

Both will achieve the same outcome, installed and setup correctly.

Do you have a heating engineer you currently use?
I'd start there! A lot of the specifics you don't really need to understand.

One advantage of going down the intergas route would be that (and dan would have to confirm this?)
You could install an intergas combi that meets your current needs with some allowances made for upgrades.
If your needs change you could add the unvented cylinder
 
Also tony can you explain what hot water storage volume has to do with boiler size???
 
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Would be a start.
I had RM. make me a 120ltr vented with 30kw/h coil in and a dry pocket.
Not bad recovery time on that one.

They've changed their tune then.... Their inflexibility in that department was one of the reasons I looked elsewhere.

Reminds me.... Muppet consultants in a project are doing a Tony and only using part of a specification to suite their side of an argument.... Ignoring the fact that alternative options do the same as or better.
 
Quite right Dan, at the moment anyone can get 10 years on the ECO RF.

Tony you say that Dan's cylinder is undersize - when is a 170 litre cylinder not a 170 litre cylinder???

I suspect most know the answer ;)
 
Back to the OP the viessmann setup is my personal preference

The intergas setup is @Dan Robinson personal preference.

Both will achieve the same outcome, installed and setup correctly.

Do you have a heating engineer you currently use?
I'd start there! A lot of the specifics you don't really need to understand.

One advantage of going down the intergas route would be that (and dan would have to confirm this?)
You could install an intergas combi that meets your current needs with some allowances made for upgrades.
If your needs change you could add the unvented cylinder
More rubber hose in a Veissmann than my Granny's Twin Tub!!! Fit the Intergas.

There's lots of unvented cylinders fitted grossly oversized.
 
Great. If anyone can get ten years on the ECO RF, it's a no-brainer! Will the 24 be powerful enough?

Larger cylinders don't appear to cost much more, so perhaps it's wise to just fit the largest cylinder i can get in the space under the boiler. Looking at the specs of the 170/200L Telford Tempest and Joule Cyclone, the Telfords seem to have slightly better dimensions, and are also slightly cheaper. But they do have slightly higher standing loss. Most of you are recommending the Joule Cyclone - is it better than the Telford?
 

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