How to rinse an indirect heating boiler

Good day. For several years we have been using an indirect heating boiler connected to the boiler. Recently, they noticed that with the same settings of the heating unit, the water temperature at the outlet of the water heater decreased. Maybe scum has formed somewhere inside? Tell me, is it possible to clean the boiler without removing it from the wall, and if so, with what?

Oleg.

Answer

Hello Oleg. The factors described by you do indicate that the outer surface of the heat exchanger is covered with a layer of limescale. Being a good heat insulator, it interferes with normal heat transfer - this is why your water heater began to work worse.

For the cleaning indirect heating boiler You can use both flushing and removing deposits by heat stroke. The latter is that the water is completely drained from the tank, after which the boiler is turned on “at full” - while the outlet water temperature should be at least 95 ° C. Water heats the coil of the heat exchanger quickly - just a few minutes. After this, it is necessary to turn on the supply of cold water to the tank, and the pressure should be maximum. Metal and calcareous crust have different coefficients of linear expansion, therefore, with sudden cooling, the scale will crack and peel.

For chemical washing, you can use both special tools that industry produces, and alternative methods. About how to use household chemicals, the manufacturer points to the packaging. We will talk about a simple, but no less effective method using vinegar or acetic acid.

First of all, prepare a working solution. For this, for every 10 liters of water add 200 g of 9% vinegar or 30 g of 70% essence. The resulting mixture is poured into a water heater, heated to a temperature of 40-45 ° C and maintained for 1 hour. Then the dirty liquid is drained and the water heater is washed with clean water. The process can be repeated, if necessary, varying the exposure time and temperature.

Instantaneous water heater will last much longer if the unit is properly operated and maintained. You can learn more about this here:https://aquatech.tomathouse.com/en/otoplenie/boilery/kak-polzovatsya-nakopitelnym-i-protochnym-vodonagrevatelem.html