a) Electric: DHW generated from electric heating elements.
b) VR Boiler: DHW generated mainly from steam or water tube vertical boiler.
c) Gas Boiler, HR Boiler: DHW generated mainly from steam or water tube horizontal boiler.
d) Co-Generation: DHW generated by combined heat and power (CHP)
e) District Heating: DHW generated by centralized heat distribution network utilizing insulated pipes.
f) Heat Pump: DHW generated by air/water/geothermal heat pump.
g) Steam: DHW generated by steam boilers.
