The only difference is in length, they both do the same thing.
Not if it was disconnected properly
A furnace water heater combo can save space, reduce energy costs, and provide efficient heating and hot water for your home.
Yes you can do that. I had an oil fired furnace that also heated the hot water in a coil inside the furnace. I got an electric hot water heater and had a plumber disconnect the coil in the furnace and hook up the electric hot water heater. No problems after four years.
This are used to convert solar energy to heat i.e thermal energy for using various purposes e.g solar cooker ,cncentrated solar power,solar water heater,solar furnace etc
A water heater thermal expansion tank helps to relieve pressure that builds up in the water heater system as water heats up and expands. This helps to prevent damage to the water heater and plumbing system, as well as maintain the efficiency and safety of the water heater by reducing stress on the system components.
The purpose of a thermal expansion tank for a water heater is to accommodate the expansion of water as it heats up, preventing pressure buildup in the plumbing system. This helps to prevent issues such as leaks, burst pipes, and damage to the water heater caused by the increased pressure from thermal expansion.
1 hour
some examples of thermal energy you could find in your home are light bulbs, microwaves, and even you can make thermal energy when you walk across a carpet in socks, creating friction.
by the way the steam condenses back to water
If your furnace is less then 50000btus then yes.
Is the furnace a hydroponic system? If it is you only need to get a heat exchanger (As you don't want the water to your heater flowing through the furnace) and plumb it as another zone in your house. If not you need to find a device for heating water that fits your furnace. and plumb the heat exchanger to that. I believe an heat exchanger is required by code in either case.
No, each must be vented seperately.