Water cylinder

[ma701ss]

Planning to install an unvented water cylinder to supply 5 showers in a club. Potentially up to 25 people using the showers after matches, in turn obviously. 5 electric showers was my first thought because there's no chance of the water running out but presumably more expensive to run and the incoming supply is not enough to the building apparently. Is there a cylinder that could keep up with the demand, and would an electrically heated cylinder recover quicker?

 

[kris]

I didnt realise they had wheels ermi ,,, do they race

 

[Ermintrude]

Smart line has much bigger surface area, stores ware at 85c and blends down to 65. It's all glass free.

 

[ma701ss]

Smart line has much bigger surface area, stores ware at 85c and blends down to 65. It's all glass free.

Thanks that ariston cylinder is within budget, we could install two perhaps but then how much are the expansion vessels?

Calculating at the only basic level I understand, 9l/m x 5 mins per shower x 25 people having showers = 1,125 litres. How is 600 litres going to keep up with that, or will it extend further if a TMV is used at each cylinder?

All I'm trying to do is work out the basis for a system I can propose to the plumber, as I said he proposed before just one 250 litre cylinder so probably hadn't worked it out at all.

 

[kris]

Thanks that ariston cylinder is within budget, we could install two perhaps but then how much are the expansion vessels?

Calculating at the only basic level I understand, 9l/m x 5 mins per shower x 25 people having showers = 1,125 litres. How is 600 litres going to keep up with that, or will it extend further if a TMV is used at each cylinder?

All I'm trying to do is work out the basis for a system I can propose to the plumber, as I said he proposed before just one 250 litre cylinder so probably hadn't worked it out at all.

Eh wrong wrong wrong what about cold water ,,, mixer showers mix hot with cold youve worked it out as just hot water which would scald them

 

[kris]

You have 600l of 65 deg hot water and when you instal the showers you have to fit colds on every one to mix with the hot, so you then have 600l hot water mixed with cold main, which will need to sufficient to run all showers plus the cylinders,,, Think youl have to get with your engineer and architect and sit down with them and knock your heads together,

 

[ma701ss]

So I've used Andrews water heater size-it tool and it gives the attached calculation. Presumably the same would apply for other heaters, so two ariston heaters should be fine but are the expansion vessels expensive?

 

[ma701ss]

Went for a 28.8kw electric boiler with 240 litre storage in the end. So many different people inc. the manufacturers all coming up with different opinions and calculations it's a wonder anybody gets it right when putting a system in! Thanks for the advice.