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I am preparing to fit a 28mm Honeywell V4043B normally open 2 port zone valve in a gravity flow circuit in a pump bypass. The idea being to allow maximum thermosyphon when the pump is not called to run but shutting when the pump comes on. (The smallbore and thermosyphon share this pipe at this...

Thanks mate I also emailed the guy on eBay who makes and sells them - he said "both tee reduce to 15mm inside, the 90 degree tee has less resistance on the gravity circuit. there is no harm in reducing pipework just before the tee, take a 28mm pump valve for example they reduce to about 18mm...

I am looking to improve my primary gravity flow by introducing an injector tee on the pumped return - I see on ebay a 90 degree one that would be easier for me to fit than the straight through one - but as it limits the pumped return to 22mm I wonder if the 90 degree one would perform generally...

We have an old Ferroli Falcon in the family - not the Mark II. After sorting out a screwed up central heating program I fired up the boiler on central heating for a few seconds, then turned it off at which point I noticed the pump kept running - ok perhaps that is normal, but if I drew some DHW...

Having sorted out my control problems by fitting a Satronic replacement for my failed and obsolete Danfoss box on my Monoflame Minor 1 pressurejet Kero boiler (with help and advice from this forum) - I have been playing with the setup after adding a couple of radiators. I have a woodburner in...

Thanks both - I will talk to HPS tomorrow - It's too bloody cold to mess any further with obsolete gear. Good job I have this running in parallel with a stonkin' great woodburner or I would be the one emigrating - or divorced - or shot - it's -10degC ouside and has been for a week Regards...

Actually I don't think there is any prepurge on this - it piles straight in and when it's lit once it fires almost immediately from then on till it's been turned off and goes cold. even now when I try it from cold it fires after about 2 seconds of fan. Until it failed that is - now it cuts...

Burnerman - do you think it sounds like the photocell? - or do failed control boxes also shut down this way? I'll have a look at the satronic in the meantime - thanks

My Mistral Oil boiler uses a Monoflame Minor 1 kero pressurejet burner with a Danfoss BHO11.1 control which is now obsolete. Recently while re-arranging some programmer connections and changing a very worn/dirty main power switch I think I have "spiked" the control box or photocell. The mod I...