NHBC position on boiling water taps:
https://www.nhbc.co.uk/builders/products-and-services/techzone/technical-updates/boiling-water-taps-guidance-for-compliance-with-nhbc-standards-and-building-control
Basically, if you have a Quooker, you won't get NHBC sign off without formal relaxion of G3...
Water boils at 110 deg C at about 1.4 bar, so the pressure in the tank must be at least that. I guess that the sequence is that when you open the tap the pressure drops to atmospheric and the water coming up the spout boils. Cold water enters the tank and it heated. The pressure in the tank...
Basically you drill a hole in the sink waste pipe and screw in a fitting that comes with the tap. Then you connect the bottom of the tundish to the screwed-in fitting with a flexible hose, making sure there a U in it to get a seal.
Quooker website: 'The water is delivered in a fine aerated spray rather than a solid jet, ensuring that you are able to move your hands to safety in time.'
Maybe, but I can't find a video anywhere of someone doing that.
Yep, a regular drip out through the pressure relief valve on the supply pipe. I'm not sure that a drip would be a concern. More wasteful than a vessel I guess.
I thought G3 was just about notification requirements? I can't find anything that says that the regs don't apply. Othwewise you could install anything.
I stand to be corrected on that though.
Yep. The one I saw today didn't even work that well. A dribble of sputtery water and a load of steam. It was bloody hot water, but that's about all you can say for it. If you were making a pot of tea you'd be standing there all day.
Not daft at all. I was talking to a guy who owns one today and asking him how it worked. He said that the Quooker guy told him that the tank was full of superheated steam and that cold water flowed through the steam and turned into boiling water. Scary stuff.
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