With a family of four, we're running out of hot water every day, and we hate the wait to shower, etc. So we'd love to use a tankless water heater - for utility and economy.
But we're stuck. Our lovely 1880 stone house has walls so thick that we can't practically cut through them, nor go up through two floors simply to vent through the roof. The vent for the current water heater is shared with the heating boiler, so that's not an option with direct venting (pipe within pipe) required for tankless. So we're going to be unable to use a natural gas tankless water heater.
Can anyone recommend a good alternative? A larger water heater probably won't completely solve our problem and will cost more to run all year long. I looked at that new GE Hybrid, but that has very little to do with tankless functionality.