pressurised plumbing system - essential features

sunnysoutheast

Hi there

We're currently getting quotes for a pressurised plumbing system for hot/cold water - driven from a condensing boiler.

What features/components do you guys feel are essential/good-to-have with such a system - so far we have a dual coil s/steel pressurised tank, cold water feeder tank, >3 bar pressure and high-quality pumps - and are there any good brands we can specify?

Many thanks for your replies as always!

SSE

ircoha

sunnysoutheast wrote:

Hi there

We're currently getting quotes for a pressurised plumbing system for hot/cold water - driven from a condensing boiler.

What features/components do you guys feel are essential/good-to-have with such a system - so far we have a dual coil s/steel pressurised tank, cold water feeder tank, >3 bar pressure and high-quality pumps why pumps? will one not do?- and are there any good brands we can specify?

Many thanks for your replies as always!

SSE

Whats the application here house/hotel/mobile home?

what output capacity is the boiler and is it modulating?

Does it match the coil capacity?

There are other threads on her about the pros and cons,

the one common comment is dont pump for the heads and keep the runs from HW to outlets as short as possible.

sunnysoutheast

ah yes, sorry, bit of key information missing there wasn't there?

single house, 4000 sq.ft.

plan is to have UFH downstairs run from one boiler with another small boiler running radiators upstairs and DHW.

gas boilers will be condensing and modulated, prob. Worcester Bosch as we had one of these on our old house for nearly 10 years. We've "over-insulated" and are fitting heat recovery ventilation.

unfortunately I think we'll have some long pipe runs, but will make sure the (hot) pipes are insulated.

take your point about the toilets, we'll make sure that's in the spec.

thanks for your help, some of the advice on this board is proving very valuable.

SSE

TempestSabre

Whats the difference between the different pressurised and non pressuried systems.

ircoha

TempestSabre wrote:

Whats the difference between

[the different]

pressurised and non pressuried systems?.

Have edited ur quote a little.

There are 2 sorts of pressurised systems, one is where the HWC is pressurised and the other where the HW is only pressurised between the HWC and the outlet. In both cases the CW will be pressurised as well.

See other posts here for more discussion, search for thermal store .

Non pressurised is just the normaal gravity fed systems.

ircoha

sunnysoutheast wrote:

ah yes, sorry, bit of key information missing there wasn't there?

single house, 4000 sq.ft.

plan is to have UFH downstairs run from one boiler with another small boiler running radiators upstairs and DHW.does this imply that u have no HWC?

gas boilers will be condensing and modulated, prob. Worcester Bosch as we had one of these on our old house for nearly 10 years. We've "over-insulated" and are fitting heat recovery ventilation.

unfortunately I think we'll have some long pipe runs, but will make sure the (hot) pipes are insulated.the issue is more waste of water than heat loss for HW, heat loss while using it not a major issue if using plastic piping.

take your point about the toilets, we'll make sure that's in the spec.

thanks for your help, some of the advice on this board is proving very valuable.

SSE

see other posts re waste of water both hot and cold with long runs, especially if 3/4 pipe