i fit the eco tecs also. but if they are a bit too pricey for you fit a main 24 he. very reliable much cheeper. its basically a potterton performa 24 (exactly the same) but less expensive
either you havent got a combi or someone has fitted a 2 x channel programmer (you only need 1 for a combi (heating) and has wrongly wired up the hot water timer to your heating
if it is a new house there wont be too much sludge build up to need a full powerflush. they probably didnt use an inhibitor or flush out the left over flux from the installation which is causing your problems. stick some x400 in it leave for 4 weeks then drain and fill a few times then add x100. but...
you can add another motorised valve. use a room stat in the toilet rather than a trv. also you will only have to open the lockshields a crack otherwise you might get problems with the rads further away.
[you can but you'll have extra 90 deg bends which could block. better to run outside. if not use a t with cleaning eye rather than a 90. then you have access to unblock.
