In good locations, energy from wastewater offers heat production costs of 7 cents per kWh of heat performance. Heat performance means: It is full costing that comprehends the complete technology (heat exchanger, development, heat pump, heat pump electricity), different than a gas tariff, which only prices the energy carrier, but not the heating or its procurement costs. Dependent on the respective framework conditions on site, the investment costs for energy generation from wastewater with the Therm-Liner system from UHRIG lie at around 500 to 1000€/kW of heat performance. Contained in these costs are the production and installation of the heat exchanger, inclusive of the piping to the shaft.
Of all 100 Europe-wide installed systems of this type, more than 90 of these are from us. We have evaluated these systems and thus know the economic key figures from practice. Wastewater heat usage needs no subvention. It is competitive in many locations, as well as in regards to other renewable energies than fossil fuels. If you use the wastewater heat not only for heating in winter, but also for cooling in summer, this is a real driver of efficiency.
Wastewater heat offers itself as a further source of the heat pump. If you compare the investment costs for soil sensors with the costs for a modern sewer heat exchange technology, the energy source of wastewater is often more economical even with a low heat extraction rate. In addition, there is the higher temperature level in the sewer and the thus higher performance figure of the heat pump.
Energy from wastewater is thus not only pure climate protection, but is also good for the wallet. With a glance at heat conversion, wastewater heat thus offers a substantial potential for decarbonization, even without help.