I posted here once previously (below), as my new modular and tightly sealed home (1100 sq ft) with a new Bosch 151 single zone FHW into +/- 30' of copper baseboard that seems to either misconfigured, misplumbed, or otherwise wrong. My two 120g LP tanks were filled on 11/22/17 and today (12/28/17), they are below 20%. The LP is used exclusively for the combi.
I am concerned that this seems to be fairly high usage for such an energy efficient system, in a well-insulated and air-tight home. It directs my attention again to my combi, and whether it was put in properly.
I am wondering what the experts think is normal LP usage for this system in an average modular very tight and insulated home with average temperature of 22.4-degrees F (Avg low of 13.3). Does ~150gal of propane for 30 days seem right?
My builder and the executor of any warranty service says it's normal, and that I am more likely to bother the HVAC installer than find a problem, but, as the below post details, something doesn't seem quite right. I still can't seem to alter room temperature unless the kitchen kick space heater is on.
Do some HVAC companies do quick visual inspections to help a homeowner determine if there is a plumbing or sizing problem?
Thank you for any insight you can lend.https://forum.heatinghelp.com/discussion/163363/pri-sec-pump-mismatch-or-gravity-back-flow-homeowner-needs-help-long?