Ask The Trades - Overflow pipe from unvented 15lt HW system

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Ask The Trades › DIY Forum › Plumbing Questions › Overflow pipe from unvented 15lt HW system

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Overflow pipe from unvented 15lt HW system (Read 2459 times)

gullrock

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Overflow pipe from unvented 15lt HW system
Feb 6^th, 2007, 11:31pm

I am installing a small 15lt unvented hot water system with a 3bar pressure reducer, the correct length of pipe between the last take off point and the unit, and a supplied safety valve. The safety valve is designed to have an overflow pipe connected to it whcih should discharge safely outside.

As the unit is some 5 m from the outside wall I was wondering if I could take the overflow into a much nearer ordinary waste pipe and include a tundish. Unfortunately I am not sure what one of these actually does or even if it would be suitable. Any advice would be much appreciated.

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thescruff Global Moderator Trade Member Author Offline Who said plumbing was easy. Posts: 6037 Total Thanks: 147 For This Post: 0 Gender: Trade: Plumber	Re: Overflow pipe from unvented 15lt HW system Reply #1 - Feb 7^th, 2007, 12:46am Just terminate it at low level, ok, so it makes a mess if it blows.
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gullrock GDPR opt-out Total Thanks: 147 For This Post: 0	Re: Overflow pipe from unvented 15lt HW system Reply #2 - Feb 7^th, 2007, 8:29am Thanks Scruff, if it does blow does it produce a continuous stream of water or just a limitted ammount?
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thescruff

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Re: Overflow pipe from unvented 15lt HW system
Reply #3 - Feb 7^th, 2007, 8:02pm

Quote:

Thanks Scruff, if it does blow does it produce a continuous stream of water or just a limitted ammount?

Normally it will drip first for a few weeks, depends on what went wrong.

Can't you get a floor gully fitted and run the pipe underground, the problem with plastic is it will not take the heat if it really goes toes up

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