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thanks for your input mysteryman but do you know why this function causes the pump to run so much and so unnecessarily? i can's see the benefit of it. also, i would have to differ with you regarding the cooling of the house. for example, if the temperature in my boiler shed through the...

i will try that with mine then... cheers, john.

any joy Dorset?

i could be wrong but i don't think this viessmann control works that way... which i why i was asking if a 'generic' wireless stat could be used but i fear it will have to be a viessmann one... anyway, i have stopped the pump going unnecessarily... there is a list of about 6 or 7 codes i...

i think i will get a room stat and see what happens. i can get a viessmann vitotrol 200 which is a fixed device but does anyone know if a generic wireless type will work with this control (vitotronic 150)? thanks

yes i mean temp sensor which is on a north facing wall, 6 or 7 ft up, wired to boiler control. i know this control acts like it's more intelligent than it's owner (which it might well be), it thinks it 'knows' when the outside temperature is colder than you expected it be so it can heat the...

sorry for asking stupid questions, i can see how you change reduced room temp to 3 deg. and indeed i have already reduced it to 3 which is as low as you can reduce it.. it's the next bit that i can't get my head round at the moment: "pump is off (in winter cycle) after a change to...

thank you for spotting that... i have read through both the user instructions and the installation instructions several times and although i have seen that paragraph before i have not actually clicked that there is definitely a very good lead there which i will follow up but to answer your...

par contre, beaucoup ca change depuis 1980! anyway, Tony, how would you arrange a heat dump in this system to give good safety cover but avoid unnecessary heat losses to the wrong areas when all was functioning well? and mountainwater, what is your heat source and could you post some...

very interesting article. do you think that could explain the situation though, bearing in mind that the pump runs for hours after the burner has shut down? unless i have the boiler set to uphold temperatures all the time (which i can't really afford) it is basically pumping cold water round...

on this site? that would be handy :D

thanks for the response Weargas. i have been through the viessmann codes and could find nothing other than frost protection (A3 i think from memeory) that would explain it apart from possibly A5 (which is a function to do with outside temp and pump operation). so... if the pump runs for...

thanks for replying Agile, it is an oil boiler and is in france so may not be available in the uk...but it should be found on the internet somewhere. regarding the control, my mistake, it is actually a vitoTRONIC 150 graced with so-called 'fuzzy logic'. the heating is set to come on for a...

by the way, cool motor a few posts back Agile....

no viessmann people out there?

anything below the insulation should be 'warm' and therefore not subject to condensation...therefore no great need for ventilation

Hi to all, re: viessmann vitola 100 with vitotrol 150 controller. is anyone out there familiar with this boiler control? i have an ongoing problem in that the central heating pumps almost constantly in the winter regardless if whether the CH water is being heated or not. there is a...

180 litres should absorb about 19kwh between 10 degrees and boiling (0.00000116 x 180000 x 90 - please check my calcs.) which should cope with Aggy's stove running flat out for about 2 hours (assuming it's 10kw). i don't suppose many stoves would have the capacity to run flat out for more than...

Agile: i think you've missed one of the relevant points here a little; Aggy has said he/she does not have the intention or the funds to employ anyone to do this for her so i suppose getting a free quote would just be a unfair waste of resources for the company you suggested. i guess she just...

i forgot about the rads...if they are the priority, what output are they? to FrankE: i wouldn't argue with you when you say that you doubt it would be feasible, but i am interested in this sort of system for myself so i would ask you to explain the reasons why you have come to that conclusion...