Sabroe heat pumps in wastewater DH project
11th April 2025
FINLAND: Swedish contractor Caverion is to employ Sabroe ammonia heat pumps utilising wastewater for a district heating network in Seinäjoki, Finland.
The planned system for energy provider Seinäjoen Voima is said to be one of Finland’s first heat recovery solutions using an ammonia system utilising wastewater.
The work will include the construction of a 1,000m3 basin for the purified water.
“One third of wastewater generated by households is domestic hot water, which means energy flowing into sewers. Therefore, we take advantage of purified wastewater, and this is a safe and environmentally friendly way to produce thermal energy for the district heating network,” said Seinäjoen Voima’s CEO Pasi Salo.
The Johnson Controls’ Sabroe DualPAC heat pumps will produce about 4.9MW of 90ºC water, sufficient for the annual energy consumption of 2,000 detached houses.
Optimised for use in district heating and ground-source cooling, Sabroe DualPAC is a two-stage high-temperature heat pump combining ChillPAC and HeatPAC units into one single heat pump.
Seinäjoen Voima is responsible for the entire production of district heat in the Seinäjoki region, an area located in the western interior of the country and along the River Seinäjoki. The combined heat and power plant is located on the shore of Lake Kyrkösjärvi.
