Hot water tanks contantly over flowing

[Reltub]

Got called to a job - overflow contantly running, got in loft open hot outlets which are all run off a wickes pump to lower water level in tanks so i can see what is causing the overflow. The vent wasnt chicking water back in and the ball valves arent passing. you can hear a humming noise coming from the shower and it stops or changes tone when you adjust the temperatue lever. I think water is being pushed from the cold main in the shower back through the hot and filling the tanks casuing them to overflow. I will attach a pic of the pump and a drawing of the config of the system.

So i need to know - can you connect cold side to the mains and pump the hot? for the shower
- is the pump being used the correct 1 (it is noisy as hell)
- could it be the water from the mains on the shower casuing the tanks to back fill?



Thanks

 

[Reltub]

Ok, I don't know who made the Wickes pump, but assuming its the same design as most twin impellers, I expect that the bearing and seal on the cold side are now completely knackered if it has been running dry since installation. Most of the good solutions to this problem involve taking a tank fed cold supply through that pump, but unfortunately thats unlikely to be possible now without replacing the pump.

What a flippin' mess.

Lol tell me about it! So basically i think they need a new twin impeller pump, a low pressure cold feed to the pump, the mains to the shower capping and the cold from the pump to the shower. Ouch and the whole bathroom is tiled!

 

[Ray Stafford]

Lol tell me about it! So basically i think they need a new twin impeller pump, a low pressure cold feed to the pump, the mains to the shower capping and the cold from the pump to the shower. Ouch and the whole bathroom is tiled!

Yep. And given the appalling standard of installation that you have uncovered so far, lord know what else you will find once you start digging.

 

[Howsie]

What was the answer to this question?

Asending spray bidet.

 

[Ray Stafford]

Asending spray bidet.

Nah, thats probably connected to the central heating flow.

 

[IDCHAPPY]

Ok, I don't know who made the Wickes pump, but assuming its the same design as most twin impellers, I expect that the bearing and seal on the cold side are now completely knackered if it has been running dry since installation. Most of the good solutions to this problem involve taking a tank fed cold supply through that pump, but unfortunately thats unlikely to be possible now without replacing the pump.

What a flippin' mess.

This^ twin boostes need both sides to be running, poor things probably well fecked