I'm very new to the geothermal scene, having just recently purchased a home on the island with such a system, distributing via in-floor heating to the ~1800 square foot, slab foundation house. As a family of six (doing lots of laundry), we're accustomed to 1000-1200 kWh/month over the past few years. Having been heating with oil and a small pellet stove, the idea of saving money with the geothermal system excited us! Unfortunately, this past electricity bill for October/November billed us for just over 3000 kWh. We're on track for 3500-4000 kWh this month, and it hasn't even consistently gotten below freezing! (We lowered the thermostats for a day to confirm the daily kWh dropped accordingly, even though the system was still contributing to the hot water heater.) Given the daily kWh usage, I have a feeling that something isn't working correctly with the system, and I'm trying to engage with the original installers -- put in about 10 years ago -- to try to figure things out. But I get the impression that I'll make the most progress if I try to take ownership of the problem for myself. A lot of this new vocabulary, so if I make a mistake, please help correct me! Note that when we first powered on the system, the overflow valve on one of the buffer tanks was leaking a small, but consistent amount of water. I put a bucket under it, and it eventually stopped leaking when the system got up to pressure. The unit in question is a Geosmart Premium E. I believe I have an open loop setup, with two wells connected to the system (one used for drinking water). The five distribution zones are controlled by single wire thermostats. I've taken a stab at diagramming the pipes as best as I can understand it, but am not sure where to go from here. See attached image -- feel free to challenge anything! I'd be happy to share pictures of the actual setup as well, but the room is definitely chaotic -- it used to use an electric heating system that's still there, but closed off. A few open questions that I'd love to understand better: * It's not clear why I have /two/ buffer tanks. * It's not clear why both desuperheaters are connected to the same buffer tank, one at the top and one at the bottom. * There's a closed valve that appears to connect the cold water distribution with the hot water distribution. (It's a tiny valve, like the kind on in-floor inputs.) I have no idea why it's there. * I was surprised to realize that I'm circulating "new" water under the floors all the time, or at least as I consume hot water, instead of the in-floor heating piping being closed. How can I best equip myself when the installers come and try to figure out what I think is excessive kWh usage? Much obliged for any help!