I have a TeleDyne Laars installed in my house....its very small...about 20x20x20 square......and does a super efficient job, my gas bill is never above 100.00 during the winter, and my heat is set on 76 degrees.....
check for available rebates from the gas company and your state....also a tax write off if available in your state
I know they went up in price for some models......but I got a boiler heater, a water heater, taps installed for the stove, dryers and grill, all piping and labor, and Gas installed from the street for 2200.00....but then again this was 1993......
the Gas company financed me for 3% interest.....50.00 payment per month....