[allycavs]

Hi Guys

I have a under sink waster heater. the model is the atlantic 10LU Model. This is new. And started to leak after installation.

There is a discharge coming out of a hole all the time. I had the installer in to look at it. He did a fix but the problem persists. I read here about how to empty the contents of the heater till i can get him in to have a look again and hopefully replace this time as maybe the unit is faulty:
http://www.flexel.ie/fenix/atlantic/atlantic.html

What i need to know is how would i recognize the discharge valve. Also in work we have a similar heater. I noticed the hole in the heater in work is plugged with some sort of putty. Is the hole supposed to be plugged?

Alan

[Billy Bunting]

It sounds like the unit was fitted without a pressure relief valve, the manufacturer doesnt supply this with the unit, if your pressure exceeds 5bar in your case then the relief valve would open to relieve pressure, if it aint there then somethings gona give.
Pressure relief valves come in all sorts of forms but a common type is ...

http://www.heating-parts.co.uk/product.asp?prd=205502

[aujopimur]

The safety is usually brass, it should be rated at 5 bar on a black knob,
sometimes a valve with a red knob rated at 3 bar is fitted.
If it has a 5bar valve fitted and it is leaking it is either faulty and needs to be replaced, or if the water pressure exceeds 5 bar a pressure reducing valve will need to be fitted to the inlet side of the heater.

[allycavs]

thanks guys. i i turned off the col water inlet. and still it is seeping overnight. i do not still know how to discharge the water that is in the tank. iw ashoping that buy turning off the cold water inlet the tank would seep to a point where the water would fall below a seeping level

[gary71]

The problem you are having is normally caused by expansion issues as discharge valves rarely cause problems, I would suggest a dripping blow off should be treated as a warning, although you've turned it off if you have power to it you can still get pressure increase.

I would start  with confirming it's not a over sink water heater, then you have to look for the required cold pipework 2.8m of 1/2inch or 1.5m 3/4 this is measured between the cold inlet and the nearest cold water draw off tee(maybe slightly less for Irish models as they can only come with a 2kw element and not 3kw like the UK versions), the right discharge valve is a 6 bar brass the European versions tend to be chrome 8/9 bar with a check valve incorporated in to it, if they are fitted straight on to the cold inlet then they allow no expansion which is a common reason for heaters bursting. For me anything over 3.5 bar I would fit a pressure reducing valve to maintain 3.5 bar this is a UK water reg.