0.5 bar working pressure, 15 litres per min cold main

[greemyamochop]

Vaillant 937 vs system boiler and unvented cylinder

Bathroom with bath, shower, basin wc

Kitchen

Cloakroom

2 x En suite shower, wc and basin

What you reckon??

 

[kevplumb]

dream on

 

[mickyg]

neither. 30kw combi will be your limit. anything else will be a waste. if there's a vented system in place i'd keep/upgrade that

 

[greemyamochop]

currently open vented but so many renovations being done it needs to be relocated and no loft space to house a tank

 

[mysteryman]

If you are not retaining the present system, you will have to get better pressure and flow from your main. It has to supply all demands at once, hot and cold flowrates.

 

[greemyamochop]

would normally fit a CRIE pump but customers budget wont allow it

unlikely to be able to upgrade water main due to position of property

accumulator worth a punt?

 

[mickyg]

whats the standing pressure, and why if this is for your customer did you even need to ask the first question, its basics.

 

[greemyamochop]

3 bar, never fitted the vaillant but was advised the hot delivery was fantastic

 

[kevplumb]

3 bar, never fitted the vaillant but was advised the hot delivery was fantastic

what comes out is only as good as what goes in fella

and at what you are stating behave

 

[greemyamochop]

so an accumulator youre saying would have no affect

 

[kevplumb]

err did i say that ?????

 

[looneyfitter]

Accumulator will sort your flow problems with ease.....Duel stream's are good with an unvented cylinder,.

 

[mickyg]

Accumulator will sort your flow problems with ease.....Duel stream's are good with an unvented cylinder,.

without knowing standing pressure thats a guess.

 

[kevplumb]

3 bar mickey

 

[mickyg]

oh yeh missed that, sorry loony agreed an accumulator will work, just bear in mind how big it will need to be for decent performance.