I want to heat my AD plant just once in a while for couple of weeks at a time when it’s struggling using my biomass boiler but don’t want to dig concrete up to bury pipes so is there a cheap way of running pipes above ground that are insulated that won’t loose loads of heat over 40 meter distance. Pipes will be inside sheds all the way under cover. These proper rehau type pipes are too awkward to bend round corners and too heavy to attach to inside roof of buildings so is there an easier way of doing what I’m trying to do?