In the countryside, I want to heat the living room and bedroom for about 80 square meters, and I am

Air source water heaters are too expensive and not suitable. Coal-fired boilers are the most cost-effective, a set of boilers costs thousands of dollars, it is more troublesome to burn coal and take coal, and there is a hidden danger of poisoning. Solar water heaters are energy-saving and environmentally friendly, but unstable, solar and electric heating dual-use can be considered, you see if there are conditions to put on the roof.

According to your description and where you are. It is recommended that you go directly to the air conditioner, in fact, you are heating for nothing more than a few months a year, buy the one that can be turned on and off at the appointment time, set it to be turned on before going home every day, and turn it off when you sleep, it doesn't cost much electricity, you can also have an air conditioner when it is hot in summer, it is very comfortable, and the maintenance rate of the air conditioner is low, it is simple and convenient to use, and it is the most suitable for you.

Solar electric water heater dual-purpose (set temperature control), add a circulating pump, at night only need to start the valve and water pump (living room and bedroom) with floor heating or water heating sheets, you can, it is cheap, and then there is the choice of air source water heater (a lot more expensive), you can choose one of them.