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a bigger rad can be more efficient at extracting the energy from the water flowing through it amd it will be then be more effective as an emmitter ;) 2 rads 500x1000 one gives you 1kw output the other 500 what one is more efficient at extracting the energy from the water? keep in mind the...

Yes but it doesn't mean that the rad can't be more efficient at extracting the energy from the water into the air it's why a t22 rad gives out more energy than a t21 rad of the same size because it has more surface area!

the difference is with aluminum rads or steel at a given size is they can have a larger surface area as its far easier to extrude complex shapes and fine details in alu than it is with steel and surface area is what gives you your output this is more true in designer fancy radiators take the...

Not sure what your meaning by that but 3rd party non opentherrm controls are garbage Openthem controls are better but seeing as most boilers don't support opentherm properly or fully 1st party controls allow the most control of the functions

Yep it does I'd look at using decent controls though not hive or nest or tado! Stick with the boiler manufacturers own ones they work much better!

Yes 9kw if that is your heat loss at -2 would keep your house at your comfort temp that you worked your heat loss out at You wouldn't feel cold at that but if you wanted it warmer then just set the t stat to 1c higher If you have 30kw of rad output at delta 50 (most rads output given at that...

how much gas did you burn last month ? -5 is possible if your in scotland even lower the further up you go and if your more exposed but -5 in surrey you should be more like -2 you calculate for the average low you will still have enough energy to heat even down to -10 how old is the house how...

i also very much doubt you need a 40kw boiler or a 30kw! have you actually had your heatloss report done as adding up your rads isnt the way to do it! i have just under 17kw of radiators at delta 50 yet i only have a heatloss of between 3 and 3.5kWh at -3c you need to find out how much you...

do you want a radiator calc or a heat loss calc if your doing it properly this is a good site https://www.heat-engineer.com/

dunno :D ive just adjusted my curve and throttled my rads to see if i can get a better return temp as last night as event though it got down to 1c with it trying to maintain 13c we still woke to lowest temp being 17.5c

honestly its less accessible and i have no idea why he fitted it there! doesnt look like that one will work the wired 200e will work but wired and not that much less, id have bought the 300e months ago but apparently no stock likely until feb!

another issue with my install the installer but the wc ntc on the east side of the house rather than the north side yes its shaded most of the time until the sun hits it then it gets warm! i need to get it moved but that means ladders :(

to be fair he was on the way to a client and im at the other end of the country so it was nice of him to even pick up seeing as he wont get any money out of it more than likely!

ah thats fb too :(

not on FB i called andrew millward the other day and had a long chat and he couldnt understand it really either. will try the Heat geek forum

on the pump subject mine has been on solid for a month ;) (except 2 points where i turned the power off )

thats the opposite of my issue with my setback set it thinks it needs to heat when it doesnt take this morning it came on at 5:40 thinking it needed to top up the heating the setback temp was set to 14c! outside it was 6.2c yet the coldest room in the house (that i care about) was 18c! the...

no room stat, no trv's i want room influence as its called to stop unnecessary heating in setback times. my normal day is fine but evening and overnight when i want a the setback to not fire unless the temp is actually at the setback temp now if i have it set at 17c it fires even though its...

not the 200w it only supports wc or this controller (in theuk) (there is a wired one too but im not doing wires and its more than the wireless one) there is also the zk03839 wireless temp sensor that isnt sold in the uk for some reason

thats exactly what i want to achieve but on my 200w my only option as £279! for the 300e controller as we dont sell the much cheaper zigbee roomstats in the uk for some reason!