Got a small problem,I have hot water,but radiators were stone cold,have a stat on the pipe,which is set at 45/50 usually,but had to put it down to 25 now for the circulating pump to kick in,any now radiators are starting to heat up....my question is,will this cause a problem,and how will this effect the hot water and the radiators,or will it be fine...thanks in advance for any help