The tanks are manufactured in accordance with European standards and are available in capacities from 500L to 2000L. They have up to two spiral heat exchangers which heat up the water in the main tank. Depending on the configuration, we can add to the heat exchangers solar collectors, a burner (oil, pellet, wood, gas, etc.), in general, devices with closed water loop heating. The tank also has connectors for temperature sensors, thermometers and electrical resistance.