The energy from this type of system is far to low for what the author describes. Instead I have a coil on my stove and it is connected to a thermostat to know w

The energy from this type of system is far to low for what the author describes. Instead I have a coil on my stove and it is connected to a thermostat to know when the stove is hot and a hot water pump and 2 hot water tanks. Cold city water enters the first tank and circulated through the coil on top my stove. This does a great job of heating a lot of water during a day. Then the second tank pulls from the first one and it is already heated saving lots of money. The first tank is not plugged in just runs off the stove. If you could take a lot of energy from the stove (my hot water set up can do that) you also have to worry about creosote build up. It is important to have a high air hot fire occasionally to get rid of it and to also clean your chimney yearly.