Check Valve possible solution?

[pimpdaddydog123]

Hi chaps.

Just did a boiler change from vented to combi.

The customer did have a shower which was running through a salamander pump.

The pump has now been removed as it’s redundant but water is mixing in the shower valve and it’s affecting hot water performance dramatically at all hot outlets even though the shower itself is working fine.

Obvious solution is to replace the shower valve but it’s a concealed one and it’s a Grohe so I imagine a replacement cartridge will be expensive.

I’m thinking a check valve on each of the inlet pipes might be a work around, is it a good plan or should I just get the customer to stump up for a new shower valve?

They are moving soon and don’t really want to do any unnecessary work but they would like their shower back (it’s isolated at the moment)

Thanks!!

 

[Deleted member 267285]

How do you know it’s mixing in the shower valve? No other mixers in the property?

 

[Madrab]

If the pipework is easily accessed then it's worth a punt, it's an easy change so if it confirmed it is the shower passing then it may sort it.

 

[plumblddy]

Definitely worth a go.
Installer of the shower might have removed the non return valves in the shower to get the pump to trigger

 

[pimpdaddydog123]

How do you know it’s mixing in the shower valve? No other mixers in the property?

We actually discovered it when the customer asked us to tighten a loose basin hot tap.

I isolated the cold into the boiler which should have isolated the hot taps but when my lad loosened the tap connector it was still running!

We check all the other hot taps in the property and they were all running (albeit at a slow rate). There are two mixer showers in the house and luckily they both have isolation valves on them so it was easy to eliminate the culprit!

 

[Deleted member 267285]

We actually discovered it when the customer asked us to tighten a loose basin hot tap.

I isolated the cold into the boiler which should have isolated the hot taps but when my lad loosened the tap connector it was still running!

We check all the other hot taps in the property and they were all running (albeit at a slow rate). There are two mixer showers in the house and luckily they both have isolation valves on them so it was easy to eliminate the culprit!

Then yes, easy solution is check valves.