Heat Pump – the Commitments

At last we are underway with our heat pump system. The instruction manual says: dig trench, lay pipe, pressure test and backfill. But it ain’t that easy. We’ve got excellent JCB drivers, Diddy and Richard, working with our long-time builder, John. We plan a route across the lawn and through the wood that gives us the necessary 400 metres of trench. We’ve decided to cut a 9″ trench for each pipe, rather than a 1 metre trench for a pair, because of the amount of extra digging. It starts well, but we immediately hit problems.