D
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All this talk of Corgi is making me nostalgic.
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Aww - Dinky!All this talk of Corgi is making me nostalgic.
The 20mm pipe has 1.5 times the surface area to lose heat to and the water flowing through it has 2.36 times as long to lose heat to it.I've only recently looked at the same issue and I did the sums to try and get a handle on it. A given length of 22mm copper contains 2.36 times more water than 15mm. Those figures are based on actual bore sizes of 20mm and 13mm respectively. When you translate that in KWh of heat lost it's not a very big deal, in my case 22mm pipe would lose 0.178 Kwh more heat vs using 15mm at a cost of approx. 0.8p. The cost of wasted water was higher at 1.54p. Even so It would be a long time before the cost of installing 15mm pipe paid back.
Hehe. Not really along those lines TBH.Aww - Dinky!
Micro bore for heating, not for hot & cold feeds though. Even so, never been a fan of micro bore. Looks horrid going up into a rad valve. Chrome plated 15mm looks the dogs.The theory that underpins microbore - no?
Damned you! That microbore pipe going into the rad I can see as I sit at this lap-top just got three times uglier and ten times more noticeable!Micro bore for heating, not for hot & cold feeds though. Even so, never been a fan of micro bore. Looks horrid going up into a rad valve. Chrome plated 15mm looks the dogs.
The principle is the same though - reduce surface area and maximise flow speed to reduce heat loss. The difference is the time a tap runs relative to a heating system - hence, your comment that it isn't worth the gain is entirely plausible.Micro bore for heating, not for hot & cold feeds though.
Do look at Viessmann. I think it's been mentioned on the forum before but they have stainless steel heat exchangers so less likely to corrode over time. They are also slightly cheaper than Worcester or VaillantI think that’s more the old ones buddy . I’m in a catch 22 , my 21 year old Vaillant is limping along so far but if I just get a new system boiler I’m screwed if I want a roof extension .
The 10 year warranty on the new Worcester Bosch ones seem attractive .
My parents had a Combi installed a few weeks ago and that seems fairly faultless over the old system boiler . Only issue so far is it’s making a 25year old mixer shower drip .
Flow rate & pressure are different.Just checked on the mains outside tap , managed 19L a min . Serious pressure !
The tester in the garage was broken , new one arrived today , I’ve got 4.8 Bar on the cold mains so I doubt I’m going to have any issues either wayI can't remember off hand. I seem to remember ours was 6 bar which was too much for our water softener (would have blown seals) so we had to put in a pressure reducing valve
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