Discuss Shower pumps in the Bathrooms, Showers and Wetrooms at Plumbers Forums; Hi
I fitted a new mixer shower pump in Feb 2012 to a gravity fed mixer shower. The old pump had worn out, it was a Triton T550. I called ...
I fitted a new mixer shower pump in Feb 2012 to a gravity fed mixer shower. The old pump had worn out, it was a Triton T550. I called triton and they suggested I changed it to the Triton T550i which pumps up to 1.2 bar at 16 litres a minute max.
Had a call a few days ago from the client to say after 4 minutes in the shower the cold stops working and only hot is coming out of the shower.
After investigating I noticed that the feeder tank in the loft is emptying quicker than it is refilling hence the cold water is running out.
I have checked with the water board and they say that the pressure coming from the road is within there acceptable limits but the flow is only 15 liters a minute.
I have tried turning down the speed of the pump but this just delays the problem
The other idea I thought would be to increase the tank size, however the loft opening is very slim and there is no way of getting another tank in the loft.
The only other thing I can think of is getting a less powerful pump?
Does the mains deliver only 15L/M, where was this tested ?? The main restriction is the seating which on a 1/2" H/P float valve is about 5mm dia (not 15mm pipe connection) So flow rate is restricted, by installing 2 you can increase the area, reducing the restriction & increasing the flow rate. If you increase the flow rate (sometimes called recovery) you can decrease the storage. In this case get more out of the cistern before the water runs out due to the use of the shower booster.
Of course you could always install a shower flow restrictor to limit the flow to say 12L/M which will still give a good shower.
Sorry peter I know you are going to call me names but pressure will not drop in shower (if anything it will increase) if the flow rate is reduced with a restrictor.
I don't go in for name calling chris, and I know from your posts that you know your stuff.
You were really quick off the mark with your reply, because as soon as I re-read my original post I changed it through 'edit' re checking the current valve in relation to the 11.5 displacement figure given for the T550i, i.e. maybe the current valve is not passing as it should.
Thanks guys for all you comments. The client is a good friend of mine at he seems happy at the moment as all works well if he has showers for 4 minutes or less.
If I teed off the supply coming into the cistern, so I had two supplies coming into the same cistern would that make a significant difference, or would it be better to put another cistern in the loft space and connect the two