Recent content by HRP123

The plumber who originally wired it up did no circuit diagrams, this was something that had really pushed his capabilities as I remember he was phoning other people for help. I can see behind the board that there are some pencil notations UF, CH etc. I've contacted him multiple times as I am...

Hmm, I'm not sure - will take another picture when I get home later from the other side - thanks

This is all SUPER helpful, thanks for this I am very grateful to each of you for your time. I'm a novice myself trying to understand this before I get someone who knows how these things work to do the wiring. This way I can make sure it is done properly. So if I understand the basics - on the...

Thanks, yes actually I have already range rated the boiler down - and generally when all the circuits are not on it works fine at half the output (20kw as opposed to 40kw) - in fact if the radiators and underfloor are on the flow temperature falls slightly because the boiler is working flat out...

It was the plumber who I hired to install this originally... yes this is exactly why I haven't called him back. I'm just trying to understand the principle of how this works as I have a friend who is an electrician but just is not familiar with this relay box. Cannot work out how they operate as...

Hi there thanks for your time to look at this. I've got a multi pump / circuit system which is connected via a relay box to the boiler and Honeywell timer programmers. Picture attached. Right now any single circuit can turn the boiler on an off at any time (assuming the programmers allow it)...

Thanks, yes, I understand what you are saying about the 90-95% efficiency, so the actual usage should be higher than projected on Heat Engineer. So because of this inefficiency your gas usage becomes 60,000kwh per annum+. Appreciate it.

Hi there, thanks for your time to look at this. I've done an estimated heat loss calculation on Heat Engineer - which comes out to 20kw approx for a 5 bed house. They also calculate total energy demand of 55,000 kw? Assuming you have a gas boiler, is this what the gas consumption should be...

Hi there, I have two old Geminox 200 litre tanks (EBS 200) below plumbed in paralell - I think from 2007 originally. I believe these are the specs below. I'm trying to work out how much energy they should consume to heat the tank from lets say 40 degrees to 55 degrees after two kids have...

Its worth considering this option of the two boilers, in fact I was just thinking about this myself. I was wondering perhaps keeping the existing 40cdi boiler but range rated down and dedicated to the hot water cylinders. And then having a smaller one, lets say 24kw which is for heating...

Thanks I see what you mean re LLH and it helps by providing a buffer (in layman terms) for different flows from the boiler. I have spoken to an expert Viessman installer but just trying to make sure (1) it will actually reduce my gas consumption while (2) providing sufficient heat. The previous...

Actually the pumps were not too much of a cost and the plumber is someone we use regularly (we do house renovations). Yes our house is bigger and we used the current system to replace a French Geminox boiler which was designed on the principle above but wasn't sufficiently heating the house. I...

Thanks for that explanation! Ah so if I understand correctly, in the mixing valves you are using the cool return water rather than wasting it. I guess it is a bit of a worry for me that with a big house, if the calculations are not correct in any way, you could have rooms which remain cold...

One more question please, having no room thermostats means you run the entire UFH at one flow temperature which is open all the time - you don't have the capacity to boost heating in one room that is used more often, and reduce in another room (e.g. guest bedroom) - aside from adjusting flow on...

That's a very helpful explanation thank you. So basically with lets say the Viessmann (I've read more about it), you wire your HW cylinder directly to your boiler, and when it calls for heat, everything else is shut off. Otherwise it sends heat at a lower flow temperature to your LLH which then...