hot water flow rate

[iasha]

having a new boiler fitted and have kind of decided that it will be either veissman 35kw, rehema or worecester greenstar 37kw.

i am looking at the hot water flow rates and even though i like the look of the veissman due to very good reveiws and it has really good guarantees (5 years) i am concerned at the 14.3 litres of HWF.

I am looking to instal a shower which will run off of the combi, will this HWF be enough if someone runs the hot tap elsewhere??

thanks all for your help.

 

[mogget]

No doubt BigBodger will be along shortly to write some nonsense.

It will depend on whether the combined flow of the shower and the open tap exceed the heating capability of the boiler, and whether there is enough flow from your mains supply.

The flow of the shower largely depends on what type of shower it is - a standard shower valve with a small rose will take much less water than a steam-hydro-bath-with-body-jets type shower.

I would suggest that you ask your gas engineer about this before ordering the boiler. He or she will be able to give more detail, being able to see the details of the situation. This being something which is hard to get across accurately on a forum.

As a starting point you could measure the flow rate from the kitchen cold tap by timing how long it takes to fill a known volume, and doing the maths to get litres per minute.

 

[Agile]

I always advise that a combi can only be expected to run one hot water outlet at a time.

Last Sunday I went to a new referb with a 28 kW boiler feeding one of those huge flat plate stainless shower heads which take about 15 li/min.

I was able to restrict the flow to what the boiler could manage and make them happy.

The East Europeans had done some stupid things. A room stat cabled to the boiler but not actually connected inside. A hand shower which always ran with the big shower head and everything well covered with tiles. I dont do showers but with retiling I would be thinking of about £400 to sort that out.

It was a high spec referb with granite work tops! pity about the workmanship!

Oh, and the patio decking was built just below the central outlet of the boiler flue!

Tony

 

[WSPH]

the product that you are buying should have manufacture instructions. check the literature of the shower head for the flow rate required.

Also how many taps can be open'd at any 1 time in your property?
Plus how many ppl live in the property?

1.kitchen
2.cloak room?
3.bathroom?

as already stated, check the flow rate you are getting currently through your kitchen tap. then keep that tap running and go open another tap and check flow rate. (you'll need a weir guage aka measuring jug)

 

[kevindgas]

we fit Vaillant 837's and they usually cope with 1 tap + a bath or shower but as Agile says wouldn't recommend it as can't guarantee anything in this situation.