Dan F Posted February 15, 2022 Share Posted February 15, 2022 2 minutes ago, puntloos said: 22mm pipe, 22mm for basins? Link to comment Share on other sites More sharing options...
Bitpipe Posted February 16, 2022 Share Posted February 16, 2022 20 hours ago, puntloos said: Can you give me a guess? The far run that the heatguy suggests to make the dedicated loop for is 12m or so, but the rest is 8-5m My calculations say that for 8m distance, 22mm pipe, 10L/minute flow rate - https://www.sensorsone.com/volumetric-flow-rate-and-diameter-to-flow-velocity-calculator/ Not ideal. Sounds wasteful too. Not sure, will ask ? Ran hot tap in WC, probably has longest dead leg off the DHW loop and is just 15mm bore. Activated MVHR booster (which triggers DHW return pump) and turned on tap. Hot water in 8 seconds. 1 Link to comment Share on other sites More sharing options...
puntloos Posted February 17, 2022 Author Share Posted February 17, 2022 On 15/02/2022 at 17:31, Dan F said: 22mm for basins? Fair point, no it's actually 15mm. Link to comment Share on other sites More sharing options...
puntloos Posted February 17, 2022 Author Share Posted February 17, 2022 10 hours ago, Bitpipe said: Ran hot tap in WC, probably has longest dead leg off the DHW loop and is just 15mm bore. And how long did that take? 10 hours ago, Bitpipe said: Activated MVHR booster (which triggers DHW return pump) and turned on tap. Hot water in 8 seconds. 8 is fine, but indeed "instant" seems to be the dream. Asked my guy to explain the whole 'branching' point. Will let you all know when I hear ? Link to comment Share on other sites More sharing options...
Dan F Posted February 17, 2022 Share Posted February 17, 2022 8 hours ago, puntloos said: Fair point, no it's actually 15mm. You can generally do basins in less than 15mm. Most basin taps i saw are limited to around 6ñ/min anyway. 15mm for kitchen/utility sinks, yes. Link to comment Share on other sites More sharing options...
Bitpipe Posted February 17, 2022 Share Posted February 17, 2022 8 hours ago, puntloos said: And how long did that take? 8 is fine, but indeed "instant" seems to be the dream. Asked my guy to explain the whole 'branching' point. Will let you all know when I hear ? You could have instantaneous DHW at the point of delivery by using inline impulse heaters (believe Jeremy did this) or wait however many seconds (30, 60, 90?) for it to pull through from the cylinder. Or go for something in-between like I did. A hot return loop falls into the 'easy and relatively cheap to do during 1st fix, very hard and expensive to do when build is finished' category. I suppose you could run the loop back to the tank but not connect it or a pump (would just be a dead leg) until you're sure it's required. Link to comment Share on other sites More sharing options...
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