Shower upgrade question

Andrew Campbell

I'm considering upgrading a gravity feed cylinder heated shower to a pumped electric shower.
My plumber has recommended either a Triton T90 or a Mira Elite
Would anyone know what flow rate I could expect from it. I realise that this is affected by the temp of the water going in/out and water supply but a ball park figure would be fine.
Its just to see if it would be significantly better than what I have at the moment
I did look in the specs on the manufacturers websites but couldn't find it.
Essentially what I want to know is how many litres of water will come out in 1 minute
Many thanks in advance

John T Carroll

Andrew Campbell wrote: »

I'm considering upgrading a gravity feed cylinder heated shower to a pumped electric shower.
My plumber has recommended either a Triton T90 or a Mira Elite
Would anyone know what flow rate I could expect from it. I realise that this is affected by the temp of the water going in/out and water supply but a ball park figure would be fine.
Its just to see if it would be significantly better than what I have at the moment
I did look in the specs on the manufacturers websites but couldn't find it.
Essentially what I want to know is how many litres of water will come out in 1 minute
Many thanks in advance

Making a few assumptions , ie showering temp of 42C and "winter" water temp of 5c and "summer" water temp of 12C then you should get the following:
7.5 KW Shower, winter: 2.9 LPM, summer: 3.6 LPM
8.5 KW Shower, winter: 3.3 LPM, summer: 4.1 LPM
9.5 KW Shower, winter: 3.7 LPM, summer: 4.5 LPM

Andrew Campbell

thanks john,
at the moment we get 2.6 L/min from it just using gravity

We have a pumped shower elsewhere in the house that delivers just over 6 litres /min and thats the sort of flow we have in mind

The water tank in the attic is inside the insulated area so I'm hoping that the flow wont drop too much in the winter

Sleeper12

An electric showers can only put out 3 to 5 lifers of warm water per minute. They can pump out a lot more but you have to slow down the flow for warm water. Triton are by far the superior shower. Mira a poor 2nd best but you have to slow down the flow in all brands

John T Carroll

Andrew Campbell wrote: »

thanks john,
at the moment we get 2.6 L/min from it just using gravity

We have a pumped shower elsewhere in the house that delivers just over 6 litres /min and thats the sort of flow we have in mind

The water tank in the attic is inside the insulated area so I'm hoping that the flow wont drop too much in the winter

Depending on residence time, the cold water temperature in a storage tank will always be a few degrees (at least) higher than in a mains only supplied electric shower. You will obviously fit the most powerful shower you can depending on cable size etc, there are plenty of posts on Boards.ie on all this and Sleeper12 and others would, I'd say, have no problem in giving some advice, just ensure that the shower you finally decide on gives you the rated power at 230V or multipy the rated power at 240V by a factor of 0.918. (230/240)^2. Most suppliers will give you the output at both 240v and 230V.

Use the following calculation if you want to do your own sums on Flow Rates/Temperatures achievable.....
LPM = ((Shower KW X 860)/(Showering Temperature-Cold Water Temperature))/60.

Andrew Campbell

thats vey useful information, thanks for taking the time to post