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Hello again heatingman. This topic has gone on a bit I know, but on page one I said "the new boiler is a Glow Worm Flexicom 30hx. The old one was a Glow Worm Ultimate 80FF". The electronic control unit in the Ultimate was failing and the old pump bearings were worn. Apart from that the system...

Hi Sam. We've followed the vent and feeds carefully all the way from the pump to the tank and they're not muddled. Other than the boiler change, and the addition of a dirt-trap, the only bit of "plumbing" was switching the feed and vent as they were in the "wrong" order before. This is the...

After a week's break, I'm back to find the top one-third of the heated towel rail full of air. I say air because I tried a flame test - and the maximum entertainment I could get was for the match to be blown out. OK, theory confirmed: It will swallow a whole 500ml jar-full and then some...

It is switched by the boiler which controls an over-run, but I think I can see how to modify your first suggestion to get around this... With the above scheme the over-run is sort of provided by the pump running constantly on a timer - except for when the timer goes off. I could always get...

Having global demand dictated by a local sensor is a non-optimal solution. The Honeywell distributed sensor system is an attempt to improve on this. Now that particular system, I agree, may introduce a level of complexity that outweighs its benefits. If, on the other hand, all rooms can be...

Sorry BigBurner, I could have made my reply clearer. I was very taken with the prospect of a "smart pump". Fixing on this, I was thinking about how it would fare if dropped into my existing system. The question then arises about a bypass - which you'd already addressed with the heat exchanger...

Amen. I've been in the innovation business for nigh-on 40 years and I do know my around a bit. I started this thread out of curiosity rather than any naive hope that I could revolutionise the heating industry. That's why I ended my OP by saying: My money was firmly on the first two...

OK, Screwfix miss a trick with the way its described then - looking at it it just looks like a manual three-speed job (so why is there a three-pos. switch if it's got automatic speed selection?) The boiler is a Glow Worm Flexicom 30HX with open vent. The pump is located remotely from the...

Thanks for making all my question marks worthwhile. :lol: My intention on starting this topic was to learn stuff in a new area of control. My motive is to see if I can improve on the comfort and economy of my own home. I don't think this is out of the question despite my meager capabilities...

Thanks Azazel. I've got plenty of height available. I suppose this is one way to test the theory that it's the regular discharge from the vent into the F+E that's aerating the water. If air continues to build up in the system then at least I can rule this out. I was thinking of rigging up a...

Pretty good guess Tony! I make it around 2 minutes. gcol, watts are the product of voltage and current. You can either have a 1.5Volt 100Watt bulb that would take 66Amps(!) Or you could build (in theory at anyway) an invertor circuit to boost 1.5V up to 240V and given 100% efficiency it could...

The only convolution I'm aware of is that little detour behind the dirt-trap. OK, it's not neat but I don't see how it could be a problem. Just checked and the water in the tank doesn't hang about when I open the drain so I don't think the feed pipe is blocked.

Sorry, let me check if I've got your messages: you said there should be a vent each side of the 3-port. I agree of course, but that's not the cause of the problem. There's always trapped gas (air?) in the system no matter how often I manually vent it. You also said that water can jet out of...

This is how it goes behind the trap: I can see how it could be neater, but could this be the cause of the water going up and out of the vent? These are the only lines to the F&E and they are (topologically at least) in the rigth places. Unequal pressure between vent and feed pipes is...

Paul, I'm actually quite impressed with the functioning of the TRVs in my home. Just to repeat, the only thing that I feel lets it down is the decision about boiler demand. Right, but far too expensive for most I suspect. And how is each rad. valve and RF thermometer powered in every room...

Good point, but I'd prefer my most used room to warm up the quickest! And commit figicide on the way :evil: Is it a condensing boiler? Mine is a modulating condenser but it doesn't have that kind of fancy pump control. I like the sound of yours! Wow, thanks. That's something I'll be...

Rats. I just read that back and realised that for inertia to carry water up the vent, it has to be replaced somewhere on the opposite side of the pump. :roll:

I'm all for applying the grey-matter DP :D BTW thanks for all the ideas guys, this problem has hacked-off a fair number of visiting engineers already. When we talk about "pump over" I don't think this is what we've got. The water only jets out the 22mm vent pipe when the pump stops (this...

This hall rad is the one without the TRV and is the one that you suggested turning down. I might have got a bit carried away turning it down (it had just wilted a fig plant on the upper level) - so the remaining path was pretty resticted. 85 was how it was left after install. I see 82 is more...

JohnD, please bear in mind that I'm an electronics engineer not a plumbing engineer so I do expect to be corrected :D I think you'd agree though that a satisfied room stat does not necessarily indicate that all rooms are satisfied. In an attempt to ensure this, it would seem to be necessary...