Tates

Hi ETC From above You appear to have helped a lot of people. My Son lives in Kent. He is about to complete on purchase of bungalow for demolition and hopes to do a self build house, approx 330m2. He has some drawings he has produced for planning but will need building regs drawings. Can you advise on these please. Any help much appreciated. Paul

HI. I installed my own GSHP and love it. Very cheap to run and reliable. Re trenches..... Yes best if pump is on the high side to prevent trapped air as pump runs slow. I went on a course provided by the supplier. Pretty basic but did give a few extra hints. I dug 4 x 50m trenches 1m wide. I was told the pipes must be 1m deep, no more as sun heat wont always get there and no less in case deep frost. I used 'as dug' sand below and above for protection. Half the price of building sand. The wetter the ground the better. Clay is good, chalk or sandy too dry. Gives better conductivity to replace lost heat. Used a 2 ton digger with driver. Took 4 days to dig, lay slinkys and refill. I have no extra heating such as log burners and house is warm enough even in deep winter. Avoid trenches near trees as they will cause shade from sun. Been running 6 years now. AS JohnMo suggested, I have a 200l buffer tank between pump and ufh and rads. Allows the pump to run longer but less frequently. My house a new build, well insulated 300m2+.