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Agile Thanks for this advice - I take your point - we want immediate good flow, and 22mm valve sounds wiser. I had forgotten orifices are usually smaller than the pipe diam by quite a margin sometimes. Ilike the glowering , threatening dark red ! Smokebox

my Lord I believe I am on top of all this, believe it or not........now where is my pencil? i am envisaging two or three steps of smple Boolean binary logic may need 3 relays. I had better put my money etc!! smokebox ps there are actually 4 zone valves, but at the moment I am simply planning...

Surely a simple 2 port solenoid operated 15mm valve can't be £100! I'll look at prices smokebox

Agile Exactly! Mattle raised possibility of bypassing back into system - eg a cylinder which I like. I think this can be done. Certainly with a wee bit of plumbing, maybe even electrically. smokebox

Agile Hi Yes i have been cheating!. Actually too exhausted to swing brain into gear yet - bad night cardiac failure (a sort of pump). My own idea so far is simpler and more elegant. Further news later!! I appreciate Vaillant's position on the matter, but because of the installation...

Agile has given me a task! See preceding post. Do you think you are excluded from assisting? If I get stuck what is the procedure to contact contrbutor privately safely and secretly? Seriously is there a method? I am new to all this sort of thing. Smokebox

Agile you are a hard man - I'll check your story about timing of power supply to and from the pump and boiler tomorrow and have a lonesome crack at the matter, but am worried about getting drawing uploaded onto the thread. I wonder if it is possible? (either task) Am I allowed to get help from...

I don't really agree all this Dan. I had his specification of boiler size, which he estimated by eyeballing the house. He was happy with a Vaillant 428 ecoTEC plus, and he was happy with a smart pump. I think the boiler was oversized, but I like to be sure myself in the coming cold ++! and I...

What a cynic! Cheer up

Some interesting and helpful observations, though some of the trade abbreviations are beyond me. When I said MIMO i was trying to talk of a presettable but fixed flow valve, such as I linked to earlier by Taconova. I was just copying Dan Robinson who is a I think a professional. What does MIMO...

I enjoy this chat - I am retired and don't charge myself! I did not buy my computers o broadband for this purpose! Do you really understand that a bypass set within the auto range of pressure is going to obviate the whole point of a condensing boiler to a greater or lesser degree this is daft...

I think that is debateable, but you could be right. Part L regs strongly suggests it at the very least I gather, though I ain't actually read them. The death was complex. electrics and the plumber put the bypass way above the top of the auto top pressure. I adjusted down because of explosions...

Step away from that autobypass! Actually you have to put one in, but you could add my solenoid or fixed 5% flow bypass. in parallel. You'd have to logically set the opening pressure for the auto bypass above the top pressure of the smart pumps range. So long as the solenoid opens quickly, the...

It doesn't need 'regulating' It is open when the zones are shut, and closed when any zone is open.

I cannot understand why you reckon saving gas is overthinking. Even the MIMO as you call it is not ideal. but better than a randomly set auto bypass! I reckon the solenoid can be easily opened and or closed by a fairly simple piece of logical wiring and a relay, though have not sat down to it...

Agile I never said anything about Vaillant technicians as it has not been relevant to my initial discussion of bypassing. He did not know the correct 'domestic' answer. Incidentally he thought my plan (proposed only at that time as suggested by Grundfos was sensible, and clearly understood the...

My lord I have been thinking! First, you are right .There is additional gear - in fact a VR61 and VR81 (in upstairs zone). The VR61 is near the boiler and zone valves . As opposed to the VR65 it allows separate control of 2 CH zones, and a single DHW zone. I am using simple 2 port zones...

So its been done before - solenoid idea ? do you know if it works satisfactorarily? What's this story about 15*C return temps - apparently below room temp - unusual but by no means impossible! Wouldnn't last long if heating was put on. But I can't see relevance or where it comes from! Yes...

to Agile The Vaillant senior area technician had an interesting way of testing the Heat Exchanger. He had a feeler gauge (about 1mm I think) which he ran round and round the spiral of thin walled tubing. Where it got stuck he knew there must have been distortion and /or pipe swelling. I...

We are in a virtually lime free area with good mountain peaty acid water! The boiler was brand new. It is not a blockage problem., of any sort. Dolt though I may be I had considered that. Then please explain about kettling and my very loud bangs and damaged heat exchanger! I could of course go...