Combi-system warm water and heating support

Location: Nothern Germany , Bad Zwischenahn

The installed 12.8 m² s-power vacuum tube collector system (80 tubes) feeds into a solar combi-stratified storage reservoir with a nominal volume of 800 litres.

Additionally, a Viessmann condensing boiler heating system is incorporated into the system which is supported by the solar combi-stratified storage reservoir in the form of a classical return flow boost.

The Viessmann solar controller monitors the s-power vacuum tube collector system and controls the pump in the s-power solar station using temperature difference monitoring and additionally compares the system return flow temperature and the temperature in the solar combi-stratified storage reservoir.

If the temperature in the system return flow is lower than that in the solar combi-stratified storage reservoir then the system return flow is diverted through the solar combi-stratified storage reservoir and routed into the condensing boiler heating system using a three way switching valve. The condensing boiler heating system weather influenced controller then decides how much, if at all, it needs to be additionally heated.

The calculated amortisation period of the solar collector system is 6-7 years.

(With a gas price increase of 15% per year)