First, let me preface this first post by giving a big thank you to the industry experts and members who dedicate their knowledge and time to inform and stimulate learning and discussion. Like many, I am coming here as a novice on geothermal technology but am considering making a sizable investment in it and therefore want to be as informed as possible. Again, I really appreciate what you've all shared. I've been in discussions w/ a local geo contractor who strongly encourages using the geo desuperheater capability to pre-heat water in storage tank (unpowered) that then has this pre-heated water available to a propane-fired tankless heater which acts as the finishing heater. This all makes logical sense to me and according to the contractor, his clients pay beans in propane to make the system run throughout the year. Importantly, I'm in Massachusetts, so the heat pump gets a good workout where I live. As best I can see, the only downside to this is the upfront cost to set all this up (desuperheater option, preheat storage tank, tankless system, plus parts and install = ~$9k) and having a propane tank onsite. I searched on this setup on these forums and really didn't come up with any that seemed to be the same. Figured I'd share and get others' perspectives. Thank you for reading and for any comments.