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View the thread, titled "Ariston under sink heater, help!!!!" which is posted in UK Plumbers Forums on UK Plumbers Forums.

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Riley

Plumbers Arms member
Plumber
Gas Engineer
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Morning all

trying to fit an undersink water heater for custard in a flat.

Only position for it is in like an old airing cupboard in the centre of the property in the bathroom.

Now ive just spoken with ariston as I wasn't sure about PRV termination and they don't endorse termination through waste pipe. I'm really confused as ive seen loads of these and cylinders terminated via a hepvo into waste. Were these installs all wrong or was the guy at ariston talking rubbish?
 
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G3 Regs let us use HEPvO valve for unvented hot water discharge as long as it’s acceptable by your local Building Control.
 
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