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More humouring .... have a look at the new TRVs. Do they have arrows on them to indicate direction of flow? Most don't care, but some do. Were the lockshield valves replaced at the same time, or was it just the TRVs?

Humour me. If you can access the boiler's pressure relief pipe outside, fix a bag on it with a zip tie and see if it fills up. If it just has a few drips in it after a day or so, it could be the valve needs replacing at some point. If the bag fills up, something is causing the valve to trigger...

No, why?

Any tips on setting an ABV? I did read somewhere that an old timer's trick was to close all rads and set the ABV to it's highest setting then open 30% of the rads and keep opening the ABV until it started to flow. Thoughts please.

Care to explain why a temperature difference can only be measured when the boiler is a condensing boiler?

You mean remove the head? And how long would you give it from cold start of the boiler to taking a measurement?

Panel rad, nothing fancy, lockshield on one end, TRV on the other. Fancy k type thermocouples clamped to the feed and return to measure the temperature drop. Boiler is an old fashioned non-condensing combi. So when is the correct time to take a measurement? Too soon and the system is coming up...

I thought one of the advantages of balancing a system was so that the temperature drop across all rads was equal so the boiler wouldn't have to work as hard and hence use less gas.

That's interesting. The Danfoss details I looked at didn't mention a max flow rate. Perhaps that's implied by being 15mm. Checking my (non-condensing) boiler specs, it says it has a min pump of 28.5l/min, and dividing by the number of rads, I'd reckon some would be under and some over 150l/hr...

You got a link to the video?

Are these your go to TRVs when doing a full install?

Don't we all though some of us have more free time than others :ROFLMAO:

Spotted Danfoss' RAS-B2 dynamic TRVs recently. Set the value according to rad size etc and replace across the house to automatically balance the heating system. Anyone any experience of using these? Are there alternatives from other manufacturers?

And in english?

Let's say I were to go round my house balancing the heating system by adjusting each lockshield using the delta T ~12C method across all 14 rads. Now let's say I add a new radiator in. It won't be closest to the boiler but relatively close. Do I need to just adjust the new one to the required...

So going with your description, the rad in the hall is strangled so the TRVs in all the other rooms manage the room temperatures. At some point, all of those rads are closed, or as near as damn it, and the majority of the boiler output is going to the hall rad. Now there are two cases: 1)...

Going back to my query, if the roomstat was set higher than the TRVs cutting demand, then the cycling would still continue as the system (pipe) cools below SP-5(say). The only way to totally stop my (simplistic) boiler cycling would be when the roomstat cuts out, and being a switch in series...

Interesting. I'm guessing there's a thermistor somewhere that provides water temperature for the boiler to work with. Also with the pump running continuously, the boiler is closer to measuring true water system temperature than a localised stagnant water temperature for a boiler sitting in a...

Just pondering ... Conventional combi boiler, not a condensing one. Heating kicks in, house comes up to temperature, TRVs restrict flow until they close off. Assume the room stat has been set way too high so never does it's thing. Somehow the boiler knows there isn't a demand for heat and...

Good spot. Thanks. Payback will be painfully long so change your boiler because it's knackered or you fancy a different white box on the wall.