Heating Replacement for a Family Home – A Simple Route to a Heat Pump
In a typical family-home neighbourhood in Dübendorf, we replace existing oil and gas heating systems with properly sized air-to-water heat pumps and coordinate the entire project.
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The existing plant consisted of an ageing Viessmann twin oil-boiler system with an equally outdated control system. It supplies two commercial buildings connected by a district heating line. For the replacement, we recalculated the required output and developed the hydraulic and control concept together with Hoval. A key part of the design was hydraulic separation between the new heat generation system and the existing distribution network.

The new plant uses a Hoval gas condensing boiler with an output of 750 kW. The Hoval control system manages a total of ten heating circuits across both buildings. In addition to the new central plant room, we built the substation in the second building and integrated it into the overall system via the district heating line. The new gas supply was also part of our scope: we calculated and planned the gas line and implemented it in cooperation with the responsible gas utility. From system sizing and hydraulic design to controls and construction, the complete plant concept was delivered from a single source. We have also maintained and serviced the entire system for several years.
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Two Fröling wood-chip boilers with outputs of 150 and 60 kW supply houses and apartment buildings in Freudwil through a private district heating network. We installed the central plant, substations and complete connections for the individual heat consumers.
