Shower priority units

[newfutile]

One of our contractors has identified a concern with multiple showers on a single 100 amp supply.(unsure how many yet i have asked for further infomation)
They have asked our company for a solution (which means me!).
Other than getting a 3 phase supply in the only other way is a shower priority unit?
Has anyone installed one of these? I was looking at the Garo units ,some are listed as priority and non priority does this mean one is a master and the others are locked out? And does a non priority one mean first come first served?

 

[timhoward]

Other than plumbing solutions, e.g. if there is combi boiler available possibly remove one of them, then yes it's work out your own max demand figure, and if you are concerned it's either bigger supply or a Garo unit.
I've used one in a Victorian town house where the 3rd floor flat wanted an electric shower and the cable run was horrendous (even by my pragmatic ambitious standards).
When I saw the flat was tiny and had a cooker circuit, I reasoned that one person is reasonably unlikely to be cooking and showering at the same time, and fitted a Garo non-priority unit. It's worked well.

 

[richy3333]

One of our contractors has identified a concern with multiple showers on a single 100 amp supply.(unsure how many yet i have asked for further infomation)
They have asked our company for a solution (which means me!).
Other than getting a 3 phase supply in the only other way is a shower priority unit?
Has anyone installed one of these? I was looking at the Garo units ,some are listed as priority and non priority does this mean one is a master and the others are locked out? And does a non priority one mean first come first served?

Yep, you are correct. We have fitted them in the past.

As an aside we did an EICR in a house once with 3 electric showers. All were kW or above and they'd never had an issue!

 

[Risteard]

Used loads of them, but usually the Hager units. (Although these aren't in a steel enclosure as they are not designed for the UK market.) Any of the units I have seen will have a 40A protective device, so in standard electric shower ratings above about 8.5kW showers you may struggle to find an off-the-shelf solution.