Thanks everyone again for all the info! You're right, I don't have different zones, but I do have more than one run of tubing (I have three). Sorry for that. Sent pics and info off to some heating companies, and they have yet to come out but do agree it's the stupid electrical tank that...
Thanks for the comments everyone! yes the system does have an expansion tank, and I have tested for leaks and the system holds pressure just fine, so no worries there. I get that it will be more expensive to run in the winter, however for my monthly bill to go from about $80 a month...
Sorry, I should have mentioned that. I'm from Seattle. My furnace is gas as is my tankless system . . . .I only went with the electrical hot water tank because the installer said that would be fine and shouldn't cost much at all to use, as in $20-30 a month, not the $160 for that unit only to...
Problem: my hydronic floor heat in the basement is costing me over $160 a month to run!
History:
Lifted the house up to finish out my basement (under 1000sq ft) three years ago. Floor was initially uneven, part concrete part dirt. Put the vapor barrier down, then 3" rigid insulation on...