I found this water heater some time ago and was wondering if this will be more efficient or use similar to what I use now in gas? http://bockwaterheaters.com/Products/gas_water_heaters.html We seem to use alot of hot water at 1 time as most things that use hot water all on at 1 part of the day and we sometime run low not to mention I use 25 to 30 therms of gas a month doing so. I have a 40 gal. tank type which is in poor shape as the thermostat must be at 160 degrees to get the water we need and looses its heat fast. I dont want tankless. I miss the other house with the 30gal oil fired water heater that never ran out. This bock water heater is basically an oil fired with a gas burner on the front. What do you guys think of it?