I think I love you. I feel like this would be exactly what would happen if I were in your situation.

We're renting a house, because, well, reasons. We are looking, and it would be our first home, but the market and availability is bonkers here.

The tankless heater was manufactured before the house was even built and the gas lines are not large enough to accommodate to scale. If the bath's running, pressure is shot. You'll only get reasonably hot water one faucet/utility at a time. If you're in the shower and another tap is called, you're fucked. It's horrendous.

Landlord got a quote about it (squirrel fan when we moved in screamed to hell so they called in service) and they'd have to run larger pipes when the time comes to replace it with new tankless.

The furnace did have a humidistat but the lines are gross and it's some kind of broken. They recommended not replacing till the whole furnace goes too. Fun times right?

The list goes on but it's not my circus, so i restrain myself to small tasks. At least our neighbors are cool. HOA blows though.