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ok, so there would be a normally closed contact that normally allows the controller output to supply the CH pump through it. the dhw pump output from the controller then comes alive and energises the relay which physically disconnects the controller from the CH pump. the motorised valve...

thanks for the good ideas simonh2. i am dealing with a previously installed situation and trying to re-use whatever bits i can sensibly use to achieve my desired result and that puts constraints on my designs. basically i don't want to spend thousands on a system that will take forever to pay...

sorry for resurrecting but now i do want to redesign the viessmann system a little bit. i haven't got round to implementing the heat store plan yet but i am going to move my dhw tank in preparation and rather than double up the heavy pipework installation from the boiler to the new tank position...

major thread resurrection... but i am going to move my hot water cylinder. i mean it this time. i have made do for a couple of years with fitting a 15l electric unit nearer to the points of use which has worked fine but now has sprung a bad leak. i could either get a new one or move the main...

it looks like the unvented cylinder/motorised valve combo is one of their products or is it possible to use an existing unvented cylinder?

mowbrayfireplaces, an xcel heat bank would require me to keep it constantly hot to ensure a hot water supply so it's not suitable for my needs unfortunately, and it probably costs a fair bit.. mysteryman, i agree with you but i will be keeping adolf and all his associated equipment. the...

Just to press you all a bit for more answers, can anyone tell me whether the separate dhw tank being heated via a coil is sensible? i have seen lots of examples where the mains cold water runs directly through a coil on the thermal store but that would only work if the store is kept up to a high...

i see your concerns but i am keeping adolf for heating both the dhw and rads whenever its needed but it won't be heating the thermal store. the store is only there as the rayburn needs to be non-pressurised and it also makes adding solar easy. i cannot let your last statement pass without...

ha! all advice is appreciated but let me tell you how things are at the moment: the previous owner fitted the viessmann and it's dhw vessel in a outbuilding and, to be fair Mysteryman, it is good apart from it's expensive to run and arrogant. Dcawkwell, electricity is maybe a bit cheaper...

thanks for that, that is a useful link but i was looking at the set-ups they have on their website and they are different to mine in that i want to have a separate dhw cylinder, partly because i already have a good quality cylinder to use. the main reason though is that i want the hot water to...

Hi to all you, i am planning to install a thermal store which will work in conjunction with my rayburn and oil boiler to heat the DHW and maybe some rads. the current DHW vessel is pressurised but i know the rayburn shouldn't work with unvented systems so that's why i am thinking the thermal...

pretty sure the baffle above the fire box is the only one. i probably should contact the manufacturer but i've got a feeling they will say go back to your dealer. the flue damper made a lot of difference and also reconnecting the flue to the back of the burner with an extra bend rather...

couldn't see mine on that doc but yes the baffle above the fire grate is in place, i don't think there are any others.

it's a Supra 'Mulhouse' with no boiler, as to the flue being too big in diameter, the outlet on the stove is 150mm so that's the smallest flue it can be connected to. admittedly the majority of the length of flue is the flexible liner which is one size bigger.

fire running with all vents open for an hour it goes really well but not that hot. get it going well then close the damper and it's hotter. i almost never close the one and only air vent. i have burned poplar (black hybrid), oak and acacia (black locust?) and there's not much difference...

hi all, i have searched and not found anything that answers my problem but if i've missed something, i apologise and would appreciate a point in the direction of the relevant thread(s). anyway, i have a 10kw woodburner and i'm burning dry wood and it is connected via a 150mm stainless flue...

i don't think anyone but the techie geek who wrote the software really knows what the reason is for constant pump operation. i've had a few false dawns when i've thought 'ah that's why it's doing it', adjusted the relevant code and then been disappointed. other times i've found that the code i...

i assumed the vitotrol 200 was a stat (amongst other things) because it tells the boiler control what the room temperature is. i'll try again to adjust the coding you refer to and i will be a bit more methodical about it this time so i can be sure of what i have done but if adjusting this...