You can also specify the temperature at which the boiler will start helping the water heater. We don't like very hot water, so our water heater maintains a temperature of about 50 degrees. If you take a shower, the water heater will cope and quickly replenish the hot water supply. But if you fill a bath, the hot water will quickly run out and the water heater will not have time to heat it. That's why we set the second sensor on the boiler to 40 degrees.

When the water temperature in the water heater gets lower, the boiler switches and starts helping the water heater heat the water faster. When the water heats up to 40 degrees, the boiler switches back to heating, and the water heater will continue to heat the water up to 50 degrees in the normal mode. This is how my single-circuit boiler works in tandem with the water heater.

In our village, many have already connected to gas.

I talked to neighbors and found out how much they spent on the connection and how much they are currently paying for gas.

The neighbor installed a gas boiler with a monitoring system and a meter with automatic transmission of readings. He spends no more than 1,000 rubles a month on heating a house of about 200 m², and views statistics through a special application or browser. The devices are powered by electricity, but the neighbor has subscribed to  SMS notifications about outages and knows in advance when the boiler will stop working.

The neighbor spent 6 months on the connection.

The documents and approval from the gas services cost 80 thousand rubles, the connection to the gas pipe and installation of communications - another 180 thousand, the rest - work on adjustment and launch. In total, it came to 300 thousand rubles - this is relatively cheap. For example, if the distance from the house to the gas pipe is not 10 meters, but 40, the cost of the work can increase by  100-200 thousand. The neighbor paid for the cost of the pipes, gas equipment inside the house and their installation separately.