I'm in private rental for past 10 year. My LL (lived in house before me) has been great- lets me decorate, had all new windows, doors, new boiler last 3 years ago, fixes any problems asap ie he really looks after the house. He only has this one rental. I in return look after it well and rarely bother him. The problem (or not) is I pay about £150 less pcm than what the same houses round here go for and houses in the band that I am paying are nowhere near as nice. Last year a radiator in the spare room wouldn't warm up. The house is warm apart from this room. LL sent out plumber ASAP and said that when new boiler was fitted they should have changed some pipework so its all getting clogged up and really it needs a whole new system. This was summer- it's now winter and obviously I'm noticing the radiator isn't working again. WIBU to push for the system to be changed and risk my rent increasing?