Monthly results:	Typically winter month: Although during cold wintertimes the collector is converting solar irradiation. Depending on the weather situation HW temperatures are possible up to 48° at clear sunny days. In average HW temperature during January has been 30.5° at the Sofia installation.
	Typically summer month: The solar installation provides HW temperatures of 66° in average during summer months, maximum temperatures up to 80° resulting from the anti – stagnation program of the electronic regulation during days with high solar irradiation and low HW consumption at the same time.

Daily results: Increasing water temperature in the storage tank during spring sunny day Detailled measurement program showing the possible increase of HW temperature during one day for a typical sunny springtimes day in Sofia. The working process starts at 10.30 a.m. when absorber's temperature raised up to a temperature with a dT of 3°K higher than the temperature of the boiler down. And it stopped at 19 p.m. with the sunset. HW temperature TB-up was increased from 27° up to 47°C whilst we had a consumption of 700 l hot water during this day.