Combi's don't work in larger houses - still true?

[Dan Robinson]

White socks, leather sandals and tan shorts ending 1.25" above the knees is the image I have.

 

[dilalio]

White socks, leather sandals and tan shorts ending 1.25" above the knees is the image I have.

That’s my old Geography Teacher!

 

[Hugh Jaleak]

Thanks for the responses. I think you've sold me on sticking with the idea of unvented. If I site the cylinder in the downstairs utility room then space isn't really an issue. I presume that doesn't change the complexity or performance other than meaning that that circuit would need to be pumped from the boiler rather than gravity.

All modern systems are 'fully pumped' now anyway, gives vastly better control over HW temperature.

 

[bernardgreen]

And, as for meeting regs???

I described the system to WRAS and asked for their comments,

Their opinion is that tt does not contravene any regulations (or any reccomendations) and is therefor compliant and acceptable to WRAS

perhaps you should go with more conventional systems that the day-to-day tradesmen on here advocate

or the systems that have proved themselves reliable and effective over many decades. They are the conventional systems.

 

[Hot&Cold]

described the system to WRAS and asked for their comments,

Their opinion is that tt does not contravene any regulations (or any reccomendations) and is therefor compliant and acceptable to WRAS

Great stuff dont suppose they issued an initial compliance certificate. Approval can only be certified by a suitably accredited test facility,would be safer and cheaper to fit a combi

 

[dilalio]

or the systems that have proved themselves reliable and effective over many decades. They are the conventional systems.

Which yours is not.

As a PHE (Plumber/Heating engineer) and contributor to this forum, my work (and the work of every other installer I know) consists of the following...

Flats and small houses; young owners/occupiers with perhaps one or two young children; modest flow rate:
Combi boiler to replace previous one or change to combi because “we want to get rid of that tank in the loft and could use the extra storage where the cylinder is”.

Larger houses that haven’t been touched for years or are being extended to include luxury washrooms; middle aged owners/occupiers with teens who’ll still be there in their 20s
(maybe 30s ): Unvented Cylinder to cope with the constant demand including running a new main or booster if required.

Ageing housing stock or flats with poor services infrastructure that have been homes to current occupiers for years and not been touched... never even decorated in some cases; elderly occupiers with no plans to modernise at all... quite often with a grown up offspring still at home or a widow/er: maintain existing installation as it is... replacing components as and when needed... good source of repeat business for a PHE, so no complaints from me... of course, these properties will eventually come into the hands of group 2 above and will then be smashed to bits and refurbished.

And that’s how it is.

 

[bernardgreen]

,would be safer and cheaper to fit a combi

Absolutely not. There is only one place that the boiler could be fitted and from there to the bathroom is an 11 metre run of pipe. The waste of water and gas while waiting for hot water to travel the 11 metres would be totally unacceptable

And that’s how it is.

for the majority of properties. But not all properties.

 

[bernardgreen]

They are the conventional systems.

Which yours is not.

It is conventional but with the addition of a passive heat exchanger to achieve mains pressure hot water to the shower.

 

[dilalio]

for the majority of properties. But not all properties.

All but yours then.

It is conventional but with the addition of a passive heat exchanger to achieve mains pressure hot water to the shower.

So it’s not conventional.

 

[bernardgreen]

What ever you want to say.........

 

[Hot&Cold]

Absolutely not. There is only one place that the boiler could be fitted and from there to the bathroom is an 11 metre run of pipe. The waste of water and gas while waiting for hot water to travel the 11 metres would be totally unacceptable

so having an untested,unapproved wras adhock diy cobbled together system is acceptable

The waste of water and gas while waiting for hot water to travel the 11 metres would be totally unacceptable

Thats not a problem with modern installation techniques which are not available via google

 

[John D v2.0]

Thats not a problem with modern installation techniques which are not available via google

Would that be 8mm micro bore pipe?

 

[Dan Robinson]