Moving on to other considerations.
If you have NG service at 8,000 ft you are a lucky person. Why the builder didn't use forced air furnace is what I don't understand. Cheap heat and easy to add central air. Maybe the gas service came after the house was built?
My (now) summer house is 100% electric because it was built in the "electric is better in the 1980's". I should have changed out the electric baseboard to a hot water system but didn't have the spare cash until it was after the time to recoup the cost. A/C is by a couple of ductless units.
Lucky they had a water softener but not sure when installed. I suspect after house build due to the corrosion on solder fittings or maybe due to the crap electrician that didn't bond all the the cold and hot water lines to ground. Softener failures are very very rare in flushing the beads into your house system.
Adding point of use (tankless) water heaters require a lot of plumbing for water and gas. When your water is very cold a tempering tank resolves the issue. Your old electric heater stripped of the cover and insulation makes a great tempering tank