wisconsin_mike

There is only one loop.

Thanks for the tip, Jim. Another concern I have is, the house came with only one water heater. It is used for everything. I don't have any issues with lack of hot water. I'm wondering about possible health concerns. A friend of mine is an HVAC guy, he said that I should have a separate water heater for the water that is used for consumption. Is this true? I've been here for quite a few years now, consuming the water. I have not noticed any adverse health effects.

I bought my house about 8 years ago. It came with an Apollo system. This system does not have an Apollo water heater, just the air handling unit. The water heater is a Maytag 40 gallon, 40,000 btu. My heating area is approximately 800 sq. ft. It has served me fine since I've been in my house. Occasionally, my soon-to-be wife says her showers are cold in the mornings, during the winter. I have never noticed a cold shower. Today, I noticed that the old Maytag is leaking, and needs to be replaced. I found a very similar 40 gallon, 40,000 btu and bought it. Tomorrow, I will be replacing it. Are there any things I need to know before installing the new water heater? Will there be any issues with air pockets, like radiators on vehicles? If so, how might I deal with that? Could I get away with a 35,000 or 35,500 btu heater? They are like $150 cheaper. I sincerely appreciate any help on this, I'm kind of in a bind here.