I am contemplating a major refurb/extension of a timber frame dwelling.
Current heating, micro bore fed, wall hung radiators and relatively
recent wall mounted gas fired system boiler.

There is also a central brick/lined flue and a gas fired Rayburn cooker.

I would like to fit wet underfloor heating throughout and use
pressurised DHW.

Does anyone have views/experience of centrally located, floor standing
gas boilers? Efficiency, noise level, cost, etc.

Rayburn combustion air is via air brick so draughty! Could be ducted
through new ceiling void.
--
Tim Lamb

On Tuesday, 28 July 2015 10:09:34 UTC+1, Tim Lamb wrote:
I am contemplating a major refurb/extension of a timber frame dwelling.
Current heating, micro bore fed, wall hung radiators and relatively
recent wall mounted gas fired system boiler.

Is the existing boiler unsuitable for the new heating load?

Running flues through ducts can be expensive and there are access requirements for inspection. A straightforward through-the-wall flue is usually a lot simpler and cheaper.

Owain

In message ,
writes
On Tuesday, 28 July 2015 10:09:34 UTC+1, Tim Lamb wrote:
I am contemplating a major refurb/extension of a timber frame dwelling.
Current heating, micro bore fed, wall hung radiators and relatively
recent wall mounted gas fired system boiler.

Is the existing boiler unsuitable for the new heating load?

It is in the way of a proposed 40% extension. I guess it would stretch
with the relaxed requirement of underfloor heating. DHW and airing
cupboard could best go next to the central flue. Bathrooms, kitchen are
scattered around the outside walls so central is as good as anywhere. Up
one end on an outside wall would lead to some long pipe runs.

Running flues through ducts can be expensive and there are access
requirements for inspection. A straightforward through-the-wall flue is
usually a lot simpler and cheaper.

Flue would be existing lined chimney already accepted for gas fired
cooker. Just thinking of ducting the air supply.

--
Tim Lamb

On 28/07/2015 10:40, wrote:
On Tuesday, 28 July 2015 10:09:34 UTC+1, Tim Lamb wrote:
I am contemplating a major refurb/extension of a timber frame dwelling.
Current heating, micro bore fed, wall hung radiators and relatively
recent wall mounted gas fired system boiler.

Is the existing boiler unsuitable for the new heating load?

Running flues through ducts can be expensive and there are access requirements for inspection. A straightforward through-the-wall flue is usually a lot simpler and cheaper.

Owain

And don't forget the condensate drain. This is usually easier if the
boiler is on an outside wall.
--
Cheers,
Roger
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In message , Roger Mills
writes
On 28/07/2015 10:40, wrote:
On Tuesday, 28 July 2015 10:09:34 UTC+1, Tim Lamb wrote:
I am contemplating a major refurb/extension of a timber frame dwelling.
Current heating, micro bore fed, wall hung radiators and relatively
recent wall mounted gas fired system boiler.

Is the existing boiler unsuitable for the new heating load?

Running flues through ducts can be expensive and there are access
requirements for inspection. A straightforward through-the-wall flue
is usually a lot simpler and cheaper.

Owain

And don't forget the condensate drain. This is usually easier if the
boiler is on an outside wall.

Ah! Good point. I could probably gravity run it to a rainwater soak
gulley.

--
Tim Lamb

On 28/07/2015 11:04, Tim Lamb wrote:
Flue would be existing lined chimney already accepted for gas fired
cooker. Just thinking of ducting the air supply.


My experience is that GasSafe engineers tend to hate vertical flue
boilers and will look for an excuse to fail them.