i am fitting a new immersion and radiators and pipe work. i am using a 3 port valve, is it wise to fit a gate valve in the immersion coil so that when i have heating and hot water on it limits the flow through the coil? will this cause a problem tho when i have just hot water on. thanks
reducing flow through immersion coil
- Thread starter rssteve
- Start date
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yup does the same job as a lockshield on a rad
no it wont cause a prob
fit it on the return
H
holty
think your getting your plumbing confused. but as i see it i think your on about a balancing valve on the primary circuit on the dhw cylinder. eg the feed from the 3 port to the cylinder and the valve off the return pipe.
B
Balderdash
Better still - use two 2-port valves instead of a 3-port.
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H
holty
why
and you still want a valve on the return
Why?? Balderdash indeed!
B
Balderdash
ad hominem indeed.
bull indeed
another plonker
answer the question
another plonker
answer the question
why do you want to reduce the flow through the cylinder when the heating is on? surely you want to fit a cylinder stat so when desired temp is reached it will shut completely allowing full flow to heating
you also need to balance the flow through the coil or the heating wont
least path of resistance etc
err your thinking of a W plan
least path of resistance etc
err your thinking of a W plan
H
holty
also on the lines of kevplumb about rad valves balancing etc. the return temp will be that more lower.hopefully
When I redid my unvented last year I was told that fitting a gate valve to a cylinder return was a breach of part L as the cylinders have been designed to heat up as quickly as possible and balancing down was not necessary. Reheat time should be quick enough that there's not much detrimental effect on the heating. With modern programmers it's possible to have the hot water come on earlier than the heating anyway.
May be the case for unvented, but not for vented, and the unvented have their own two port valve anyway. I have had to fit a restrictor on systems purely because the HW circuit had too much flow. It was causing pumping over via the vent pipe. The cylinder will not heat up any quicker just because the flow is higher. The water in the coil has to have enough time to give up its heat. EXACTLY the same as radiators being fully open, you don't get any more heat out of the water. The water just gets back to the boiler to hot.
For maximum efficiency all circuits should be balanced, however on a small domestic system , adding DRV and control stations, etc, etc, is OTT and un-necessary.
Disagree with a couple of comments by Oilman, of course it will heat up quicker if you have more flow, or slower if you restrict it, that's the whole point of balancing a system, but as above the advantages are minimal on a small domestic.
Disagree with a couple of comments by Oilman, of course it will heat up quicker if you have more flow, or slower if you restrict it, that's the whole point of balancing a system, but as above the advantages are minimal on a small domestic.
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