Did you realise that hard piping the pressure relief valve to the waste pipe (like the one in the picture below) is non-compliant with, and does not conform to, the water or building regulations.
Fitting a non compliant installation is illegal and if a building owner/user is issued with a non compliance notification and fail to rectify the notice they would be served with an enforcement order/notice, if they then fail to comply they could be criminally prosecuted and if found guilty, receive a fine.
We see many, many water heater pressure relief valve discharges installed like this one, in fact, anecdotal evidence suggests that well over 50% of installations are installed non-compliantly like this.
Why is this installation non-compliant?
Because the regulations state that;
If the PRV discharge is connected to a foul waste or soil pipe there must be an air break to drain. This is a requirement to prevent ANY potential fluid coming back up from the foul (category 5 fluid hazard) drain and contaminating the wholesome hot water. A non-return style valve simply does not give enough protection against this potential hazardous contamination.
Equally important is that if it is hard piped there is no visible signs of water discharge (leading to undue consumption) and;
There will be no visible warning to indicate something is wrong with the water heater itself or the expansion vessel!
But if so many are fitted this way non compliantly…
Why are they fitted this way?
Is it because the installer;
1/ Had no knowledge of the requirements?
2/ Had a lack of cost effective credible alternatives?
3/ Was unaware of the current water and building regulations?
4/ Had simply always done it that way and no one had said anything was wrong?
Now there is no excuse, because hotun has been invented so that installations can be done compliantly – quickly and easily.