Power shower

[zacloftus]

Good morning, I have been asked by a customer to increase the power/ flow of his shower.
The current installation is main feed electric 8.5kw shower. I haven’t tested the main pressure at the shower as yet but let assume it is 1.5 bar. The heating is a vented y plan gravity system. The bathroom is too far from the hot water cylinder and the loft space has been converted so running pipework if possible will be to very expensive.
My questions are does a larger rated shower unit say 10kw produce a higher flow rate or just a hotter shower?
Or could I fit a water heater in the loft to supply unvented hot water to the shower mixer?

 

[erpkid]

Good morning, I have been asked by a customer to increase the power/ flow of his shower.
The current installation is main feed electric 8.5kw shower. I haven’t tested the main pressure at the shower as yet but let assume it is 1.5 bar. The heating is a vented y plan gravity system. The bathroom is too far from the hot water cylinder and the loft space has been converted so running pipework if possible will be to very expensive.
My questions are does a larger rated shower unit say 10kw produce a higher flow rate or just a hotter shower?
Or could I fit a water heater in the loft to supply unvented hot water to the shower mixer?

The 10Kw option will be slightly better flow for same temp but nothing compared to a power shower. I think the unvented option would be more expensive than the pipe work but hard to say site unseen. With a negative head unit you have lots more flexibility on the pipe runs.

 

[chris watkins]

Good morning, I have been asked by a customer to increase the power/ flow of his shower.
The current installation is main feed electric 8.5kw shower. I haven’t tested the main pressure at the shower as yet but let assume it is 1.5 bar. The heating is a vented y plan gravity system. The bathroom is too far from the hot water cylinder and the loft space has been converted so running pipework if possible will be to very expensive.
My questions are does a larger rated shower unit say 10kw produce a higher flow rate or just a hotter shower?
Or could I fit a water heater in the loft to supply unvented hot water to the shower mixer?

Installing a 10kW unit will give a slightly higher flow rate, the temperature is not effected. When using these instantaneous water heater the temperature is said to be inversely proportional to the flow which is just a posh way of saying the more you reduce the flow rate through the unit the hotter the water gets coming out & visa versa. Installing a larger electric shower may also cause you problems with the power supply the 8.5 could be supplied through 6mm2 cable depending on the length of the run the 10kW will require 10mm2
If you want a good shower flow rate you are alway better to store water & heat it up over a period of time.

Please don't forget the installation of an un-vented hot water system falls under the Building Regulations Part G3 & as such is both notifiable & must be installed by somebody who has there un-vented ticket. Do you have yours zacloftus ??
Welcome to the forum. :welcome2:

 

[zacloftus]

Thank you for your time Chris. My understanding of this forum is sharing plumbing experience with follow tradesmen. As it happens I am as are my staff, fully qualified in all the aspects of plumbing and general construction work we cover. However there is a country mile between qualifications and the experience of some else who has faced a similar problem and overcome it.
best regards

Zac