"It's been all it was advertised to be. I've kept meticulous records and the average monthly utility bill has been $175 (for a 5,000 sq. ft home). That includes heating, air conditioning, hot water, lights and appliances. I've looked at other manufacturers and in the end, found they did not have the package WaterFurnace does. I'm a big fan of WaterFurnace and Total Energy Concepts."