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That seems to be the case, Tony (rough analogy might be a slow version of AC waveform chopping, right?). If so, it beats me what this "6 cycles per hour" means. No resistance, Oilman. I read it and was grateful. But "six cycles per hour..." :?: :?: :?:

And you chide me for asking? Who is this 'expert'? Forget booze - you must wean yourself off the grumpy pills. If my questions are stupid, or you think I'm incapable of understanding the answers, then by all means say so. I thought that by raising this issue, others who have scratched...

Does it have a Michael Fish filter?

Or go down the curry house followed by eight lagers... (sorry, couldn't resist it)

Well if you two bugg$rs don't know I might as well look it up in the Bible. Thank you for saying what I thought all along. It's either marketing hogwash or there is some sense behind it that only they understand and are not prepared to share with our pretty little heads. This is all very...

If it's any consolation, Humbug, these will look a lot better when they are camouflaged by paint the same colour as the background. Not wishing to stick up for this awkward bloke, if you're lumbered with what he's done it will be greatly improved by decoration. You could also get him to do an...

In my last post on thermostats (now buried) the question of thermo-proportional setting arose, courtesy CH4. Danfoss describe it as an "energy saving" feature where the boiler is told to fire in cycles (3 or 6), thereby keeping the room at a more constant temperature. But what exactly is...

I strongly recommend you don't 'pass water' through a length of T&E :lol: :lol: :lol:

Megawatt, I'm sorry you feel you have to turn this into an "I'm right and you're wrong" argument. There are shades of truth in all this but also a hint of apple/pear comparison. All I'm saying is that in everyday terms - eg comparing the behaviour of electricity in a length of T&E with water...

Very good point, Chris. I buy it. Indeed they do. But electricity lacks the equivalent of convection and turbulance, both highly significant in fluid mechanics. Also the effects of electrical radiation are small at normal voltages (less so magnetic, which has no liquid equivalent). When it...

Thanks CH4 - the DIP switches are really the last possibility. Hard to imagine how they explain some of the LCD segments fading but I'll give it a go... HOWEVER, sent a polite email to Danfoss sales and got a gusher back today from the supervisor, no less, apologising profusely for the...

Are you, dare I say, assuming this? :wink: The towel rail that shouldn't work, does. That's not an assumption - try touching it! Admittedly it feeds back into the same return pipe so there is some kind of closed circuit for the water to move around if it wants. But if you looked at the...

The WIFE??!! Caroline lives in Bognor, not Brighton :lol:

With the greatest respect, Megawatt, electricity and water don't behave in the same way. Water is affected by turbulance, convection, radiation and all manner of unpredictable behaviour. I have a kitchen towel rail which in theory shouldn't work. It's connected in parallel with the return...

Thanks for your suggestions, guys. Nah, I'm sure it has nothing to do with loose connections or wrong settings. This model is effectively a standalone battery operated switch. It shows the same odd behaviour whether on or off the wall. Nearest rad is about 10ft away in a large conservatory...

Oilman told me to :( Also, most circuit diagrams (including the Honeywell) show the valve on the flow. I guess it's because this stops the hot in its tracks. Placing it on return could cause a significant amount of thermal drift into the system. Only guessing - what do I know? Here are...

Thanks for the suggestions MM, but I honestly think this one is a turkey. Being battery powered, it operates off the wall, completely disconnected from the system - and is just as stupid. If the thermistor is faulty it should be their problem, not mine. What I'm after is a like-for-like...

Well I can't for one. By "2-way valve" do you mean two-port? In which case is a contradiction. A 2-port can only control one circuit. Also, it is best practice to fit these valves on the flow, not the return. You need to think harder about how to express this type of question. You...

Last year I fitted a Danfoss RET B-LS room thermostat. Since then it seems to have deteriorated. The hysteresis is so small that it switches itself off before the boiler has lit. Worse, it sometimes turns off a few seconds after the boiler has fired, followed by a continual round of...

Good. We don't want people filling your virtual head with the wrong ideas.