Not rude at all, we all have been taught, then modified what we have found out with experience & hopefully we are all here to learn some more.
Understand where you are coming from on the old balancing but there is a better way I think & it is linked to the old Part L again.
Because the coils are so big in the modern cylinders (aiming to reheat in around 20mins) what we don't want to do is try to do both at the same time i.e. heating & hot water, as most systems / boilers are just not going to be able to provide for both in a reasonable time scale.
Instead why not encourage the use to set the hot water, say to come on first, dedicating all the boiler power available to heat the HW, after around 30 mins program the heating to come on by this time the cylinder will have been heated & the zone valve closed now the boiler will be able to quickly heat the emitters. (once the house is up to temp if the HW needs to top up the drop in heating water will not be noticed)
The main reason we don't want to be fitting the old balancing valve is that a slower flow rate / heat up of the cylinder will lead to boiler cycling which is as we all know is inefficient bearing in mind that for most of the year the heating is not on just HW. I believe this is why the coil sizes of cylinders was increased under Part L.
What do you think ?
thks buddy as i certainally wouldn't wish to offend and agree it's always nice to learn things regardless of how many years in the industry
i see what ur saying with regards to quick recovery cylinders and stopping the boiler from cycling
would u mind if i put this up and how I think it through , yeh I know need to get out more, lol
if for example a gatevalve was fitted onto the return of a quick recovery cylinder
going for for a recovery time of 25 mins
if the ch is on at the same time the boiler shouldn't cycle too much as it would go on and off on the boiler stat and of course what the demand call is
so of course want the heat out the boiler as quick as possible and back for reheat , with a differential of between 15 to 20 degree differential
if then the ch goes off and there is too much restriction via the gatevalve i agree it will slow the reheat of the cylinder and could cause the boiler to cycle if it can't get a decent differential
but if the circ is say a 15/60 instead of a 15/50 the boiler should then be prevented from cycling as the heat is leaving and returning to the boiler quicker, lowering the differential and thus preventing the cycling
so that when the ch comes back on it allows the hw to not rob everything and allow the furthest rad to heat and give a better balanced system
But , then understand there could be a higher possibilty of cycling on the boiler in hw mode only , as the cyl gets older
with regards the ch and a rad not getting hot that is far away , then that should have been sized properly
so in other words , gary , don't fit gatevalves on bloody quick recovery cylinders, lol
but ok on normal ones, lol
plus us we all know what customers can be like , asking why does my rad cool off when the hot water is on
but in the same way a combi works , in shutting off the ch when hw is on
hows that