Evacuated Tube Solar Collectors

Evacuated tube solar thermal collectors are more efficient than flat panel type collector owing to their construction. The tubular shape allows sunlight to be collected from a wider angle than flat panels, resulting in better performance in systems where the roof does not face directly south, whilst the integral vacuum affords excellent insulation from the ambient air for improved heat output at lower external temperatures.

Collector specifications

An evacuated tube solar thermal collector

10 Tube Collector 20 Tube Collector
Dimensions 1955 x 852 x 100mm 1955 x 1632 x 100mm
Weight 42kg 78kg
Gross Area 1.70m² 3.25m²
Aperture Area 0.94m² 1.88m²
n0 0.681 0.681
A1 1.982Wm²/K 1.982Wm²/K
A2 0.0124W/m²/K² 0.0124W/m²/K²
Minimum Output 890kWh/year 1780kWh/year

Package information

10 Tubes 20 Tubes 30 Tubes 40 Tubes 50 Tubes
Array Dimensions 1955 x 852mm 1955 x 1632mm 1955 x 2534mm 1955 x 3314mm 1955 x 4216mm
Typical Cylinder Size 150L 200L 300L 400L 500L
Typical Occupants 1 2 3 4 5
Solar Input for RHI 662kWh/year 1118kWh/year 1549kWh/year 1961kWh/year 2368kWh/year
Estimated Annual Fuel Saving 863kWh/year 1456kWh/year 2017kWh/year 2554kWh/year 3083kWh/year

The above example figures are calculated using MCS MIS 3001 Solar Domestic Hot Water Calculation v1.0 guidelines and are based on an MCS compliant system using a south facing array on a 40° pitched roof connected to a cylinder of typical size with the typical number of occupants in London, UK.

Please note that the performance of solar heating systems is impossible to predict with certainty due to the variability in the amount of solar radiation (sunlight) from location to location and from year to year together with variability in heat demand. This estimate is based upon the standard MCS procedure and is given as guidance only. It should not be considered as a guarantee of performance.