I'm not sure I see the point of 3 either - heating hot water still requires additional energy from the boiler equal to the amount of heat that goes into the cylinder regardless of whether the boiler is "already hot".
The only benefit of heating hot water at the same time the central heating is already on is that the heat losses from the boiler itself while it is hot are amortised across both central heating and hot water heating rather than applying on two separate occasions, but the effect of this would be quite small in practice I think.
Last edited by DBMandrake; 19th November 2016 at 11:16 AM.
I would have thought it more efficient to heat the stored water when rads were being heated rather than the boiler coming on again only for water?
In terms of the summer, I'd definitely want to be able to heat water only.
My main interest however is finding a way to modulate the GlowWorm boiler from Evohome.
Last edited by Ro-; 19th November 2016 at 12:58 PM.
Surely, for a condensing boiler the key factor is boiler output temperature. As explained to me, hot water is normally afforded priority and the boiler temperature is cranked up to give a short burst of cylinder heating. For the rest of the time, the boiler temperature is modulated down to achieve the required CH output at max boiler efficiency.Originally Posted by Ro-
Last edited by HenGus; 19th November 2016 at 04:43 PM.
New topic:
My other-half says why on the HR92's does she have to turn them anti-clockwise to turn them up when on every system (volume control, thermostats, etc.), anti-clockwise turns things down! Other than me saying they were designed by engineers to probably match and mimic a TRV, to which she says, but their not standard TRV's they're electronic devices, I don't have an answer for her...In later designs this ergonomic aspect should be considered as I think most of us find the direction counterintuitive, when it could have easily be changed over in software.
It's a bit like my Audi, to go up the MMI infotainment system menu I have to turn the dial anti-clockwise and vice-versa for down, I get it wrong every time I use it, must be a German thing
Same with everything. The idrive in my beemer goes the wrong way. The ring on my Amazon Echo turns the wrong way. And of course, every USB plug ever fits the other way up.
A TRV is a valve like a tap. Which way do you turn a water tap to turn it on, clockwise or anti-clockwise ?I reckon that right hand threaded taps predate things like volume controls by several centuries...
But I'm sure the reason is simply to mimic a conventional TRV. If it was opposite to a conventional TRV I think you'd get more people complaining than the way it is now. They could have made the direction a configuration option of course.
Last edited by DBMandrake; 19th November 2016 at 04:42 PM.
I agree. Very strange decision I think.New topic:
My other-half says why on the HR92's does she have to turn them anti-clockwise to turn them up when on every system (volume control, thermostats, etc.), anti-clockwise turns things down! Other than me saying they were designed by engineers to probably match and mimic a TRV, to which she says, but their not standard TRV's they're electronic devices, I don't have an answer for her...
Yes, I've forgotten about that idiosyncrasy on the 320d (and that was only last year), although it was the best car I've had, but gadget wise it was a bit basic compared to the Audi (but sort of confirms it's a Germanic thing
I already sent this to the Honeywell contact point, but no reply.
A) Dual relay box compatible with standard / legacy backplate. This will allow two relay outputs to easily be taken to a wiring centre and hence easy to medium effort to wire in to existing or new components. Doesn't allow for low voltage use of relay contacts, but I think that's reasonably rare and that situation can always be handled by single relay box.
B) Configuration of zone as time based (ie simple on / off times rather than active management). Particularly for leaving HW on legacy local stat rather than with wireless sensor and relay, but with out if home remote override. Would play particularly nicely with item A for easy retro fit.
It could be another software config item to choose which way you want it to work. I find the way it works confusing as well.New topic:
My other-half says why on the HR92's does she have to turn them anti-clockwise to turn them up when on every system (volume control, thermostats, etc.), anti-clockwise turns things down! Other than me saying they were designed by engineers to probably match and mimic a TRV, to which she says, but their not standard TRV's they're electronic devices, I don't have an answer for her...
It's a bit like my Audi, to go up the MMI infotainment system menu I have to turn the dial anti-clockwise and vice-versa for down, I get it wrong every time I use it, must be a German thing
Posting Permissions
Reply With Quote