I don’t think the Federal government has any business getting involved in such mandates. But I suspect that these higher efficiency furnaces will save most users quite a bit of money.
Not sure about the cost savings for some folks. They have more (expensive) parts to fail, and nat gas is very cheap these days.
It’s minus 40 right now up here, we have 2 wood stoves in our cabin; toasty 75 degrees. Before installation, I was going through 2000 gallons of oil a year in my oil fired boiler. I’ll stay with the birch & spruce which I actually enjoy hauling in with the snowmachine when it’s up around zero.
I agree with you on the role of government but question the savings when you consider the "front loading" cost of the equipment and installation.
I would love to have one of those "demand" water heaters, either electric or gas and I suppose if I wait the government will "demand" that I install one. The problem is I have a private well and the pressure varies as the deep well pump cycles on and off. That means that the flow varies and the water temperature goes all over the map as the controller can't keep up with the fluctuations. I'm sure the bureaucrats won't care and tell me to go on "city water" which is miles away from my house...
Being a hydraulics educated engineer, I scoped out a way to get constant pressure but the required changes to my plumbing would probably cost more then I would ever save with the demand heater. Sigh... Maybe I can buy an old water tower from a bankrupt town.