Advice please on an unvented cylinder

[Best]

If your friend is a decent G3 plumber then he will sort what is best for you.
Flow rates are most important

 

[The Ancient One]

I would go with the Gledhill or a ThermaQ both are very good; both for longevity and heat recovery and middle of the market for price.
Heatrae Sadia are very expensive, they are the Rolls Royce of cylinders and if you have aggressive water or Private Supply they will give good service.
As for warranty across the board these companies will wriggle out of their liablity - they pay some very expensive people to write the T & C's!

 

[PDS]

Hi Gents, I'm a newly qualified installer and was wondering if you guys had any problems fitting these tanks with CWM feed flow rates below that stated by the manufactures.
I have a customer that would like to change to one of these from a vented system. The CWM has good pressure at the stopcock (4Bar)
but flow rate is 16 l/m at high demand. Most manufactures recommend a minimum of 1.5 Bar and 20 l/m flow rate.
The customer has 2 bathrooms and 3 on-suites.
Be good to know what you guys suggest.

 

[ShaunCorbs]

Accumulator needs to be installed

Is that a 4 bar dynamic or static eg with an outlet open ?

 

[PDS]

Accumulator needs to be installed

Is that a 4 bar dynamic or static eg with an outlet open ?

Yes, this is with the outlet open.

 

[ShaunCorbs]

An accumulator would be perfect then do you know how to size them ?

 

[SJB060685]

As Shaun says PDS an accumulator would be ideal for your situation, this will maximise working pressure and flow rates but do need to be sized properly or if it runs dry the working conditions will revert back to what you have now. Also and this is not the case now sometimes a charging pump is needed to boost flow but this is usually when incoming pressure and flow is very low. Upgrading pipework can also help in this situation depending on what the original carcass is but as Shaun said the accumulator will do. If an accumulator is sized correctly and installed correctly then there’s virtually no limit to the amount of appliances working from it. Although I have done my G3 in the past and done a few cylinders I can’t say what size is needed but I’m sure Shaun can advise as he said.