Under counter water heater waste/discharge pipe

allycavs

Hi

In pic, the pipe going to left of top blue valve is going to waste pipe. Is this pipe a discharge for water heater?

Not in pic the waste pipe has the pipe discussed above and washing waste going in which leaked and I fixed. I would like to know how to get the pipe in pic to release water so I can make sure all is OK at the waste pipe

Thanks

aujopimur

It's a pressure relief/safety valve, twist it anti-clockwise to get it to open.

I'd be more concerned about your installation as that is a pressurised hot water heater you have to take in to account what will happen to the plastic pipe used if the stat fails (it will melt/split as the pipe tells you), what impact expansion is having if any, what is yourbinvoming mains pressure and is it to high and lastly does your safety device terminate in a safe manor.

Bit of info:https://www.aquahot.co.uk/hyco-sf10k-speedflow-premier-undersink-unvented-water-heater-10l

allycavs

aujopimur wrote: »

It's a pressure relief/safety valve, twist it anti-clockwise to get it to open.

If I open it will water drain and once closed will tank refill with correct pressure still in place? If it's any more complicated I will leave it alone as sounds like this valve will only be opened by a person fixing issue there. So this pipe has never been opened since installation and therefore never has wayer flowing out

allycavs

gary71 wrote: »

I'd be more concerned about your installation as that is a pressurised hot water heater you have to take in to account what will happen to the plastic pipe used if the stat fails (it will melt/split as the pipe tells you), what impact expansion is having if any, what is yourbinvoming mains pressure and is it to high and lastly does your safety device terminate in a safe manor.

Bit of info:https://www.aquahot.co.uk/hyco-sf10k-speedflow-premier-undersink-unvented-water-heater-10l

I have no idea tbh. I was just fixing a leak at waste pipe which was because this pipe and washing machine waste were not fit comfortably into waste pipe together. Now both fit comfortably in there

allycavs

allycavs wrote: »

I have no idea tbh. I was just fixing a leak at waste pipe which was because this pipe and washing machine waste were not fit comfortably into waste pipe together. Now both fit comfortably in there

The water from that heater can melt the waste pipe, you cannot plumb the discharge into a waste pipe unless you first fit a trap designed to take the heat.

These heaters can/do cause massive amounts of damage when fitted incorrectly, the UK approach is you must be registered after completing a 2 day safety course that must be repeated every five years to prove the installer understands the safety requirements for these heaters unfortunately in Ireland there is no regulation so there often fitted in a dangerous manor the only thing that saves us is the low mains water pressure.

allycavs

gary71 wrote: »

The water from that heater can melt the waste pipe, you cannot plumb the discharge into a waste pipe unless you first fit a trap designed to take the heat.

These heaters can/do cause massive amounts of damage when fitted incorrectly, the UK approach is you must be registered after completing a 2 day safety course that must be repeated every five years to prove the installer understands the safety requirements for these heaters unfortunately in Ireland there is no regulation so there often fitted in a dangerous manor the only thing that saves us is the low mains water pressure.

Thanks Gary for the advice. The washing machine drains into same waste and I put on 90 degrees washes .this is how it was always plumbed. Next time I've a plumber in I'll make sure he has a look.

allycavs

allycavs wrote: »

Thanks Gary for the advice. The washing machine drains into same waste and I put on 90 degrees washes .this is how it was always plumbed. Next time I've a plumber in I'll make sure he has a look.

Your dealing with pressurised hot water, total different animal and normal household wastes are not designed to take the pertinently higher temperatures from unvented water heaters, there is a given format due to injurys and property damage in the past albeit that the safety requirements are usually ignored.