Non return valve necessary?

[Bob beach]

Hi
I’m in the process of redoing my bathroom and adding a exposed thermostatic shower mixer
I have a Potterton Titanium 33 (ErP) Combi Boiler
My question is do I need to add non return valves to the hot and cold feeds to the mixer ?
If necessary what is the maximum distance from the mixer that would be ok ?
Reason I ask is I have fitted everything already and intended to add them but forgot
I can add them about a metre away which is still exposed to fit
Cheers

 

[ShaunCorbs]

No as it’s balanced supplies aslong as there both fed from the water mains

 

[Ric2013]

Only if the shower hose is long enough to be able to be dangled into the shower tray. Otherwise no. And it doesn't matter that they would be a metre distant.

 

[Bob beach]

Only if the shower hose is long enough to be able to be dangled into the shower tray. Otherwise no. And it doesn't matter that they would be a metre distant.

Cheers folks it’s exactly what I thought with the above post
No dangling bits in the tray !!

 

[ShaunCorbs]

Only if the shower hose is long enough to be able to be dangled into the shower tray. Otherwise no. And it doesn't matter that they would be a metre distant.

Dcv or scv don’t protect against cat 5 water so best to make sure it doesn’t go below spill level

 

[Ric2013]

Dcv or scv don’t protect against cat 5 water so best to make sure it doesn’t go below spill level

Unless the OP can dangle the handset in the WC, I don't understand the reference to Category 5 water. A shower tray would be Category 3, unless legislation has changed recently without my knowing.

Shaun?

 

[ShaunCorbs]

Unless the OP can dangle the handset in the WC, I don't understand the reference to Category 5 water. A shower tray would be Category 3, unless legislation has changed recently without my knowing.

Shaun?

Bath or shower water is cat 5 also kitchen sink is cat 5 aswell classed as dirty contaminated

Edit

Sorry your right commercially it’s cat 5 but diy it’s cat 3

So dcv is acceptable

 

[AWheating]

Many customers think your crazy when you tell them you want to fit a restraint because the head can reach the toilet. Fit a very short hose and leave the longer hose on the window cill for the customer to "store"