Hot water cylinder capacity | Bathroom Advice | Plumbers Forums

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H

Harpmatic

I have recently had an extension built and at the same time I have the central heating/hot water boiler changed and moved into the loft. The extention added two bedrooms and an Ensuite to the existing 3 bedroom house. I requested that the shower in the ensuite and the shower in the familly bathroom were to be pumped to increase the pressure.

Here is my problem! Using the ensuite shower only we are running out of water after approx 10 minutes of showering. I have three teenagers in the house so getting just one average shower per tank of hot water is useless. My plumber said that the tank he fitted is a large tank (1050 x 450 mm, 140 ltr). The pump is a 2 bar pump with a max flow of 9 ltrs/min. So if I assume that the pump is working to its maximum then is 10 mins of shower I will use 90 ltrs of hot water. therefore am I correct in assuming that a 140 ltr cylinder is too small to cope with the requirements of a familly of 5?

My estimate is that I would need a 300 ltr + cylinder.

Can anyone confirm that I am correct or advise where I am going wrong in my estimating. Also shouldn't the plumber have worked out what size tank is required based on pump flow and ocupancy usage?:confused::confused:
 
Is the shower receiving a pumped supply for both hot and cold? I.E is the 9l/min the combined flow rate from both supplies?
 

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