Heating Systems – Projects and Qualified Teams

Heating system construction sits at the centre of the energy transition: heat pumps, hybrid systems, pellet and wood boilers are increasingly replacing oil and gas heating. The trade covers heat generators (air-source and ground-source heat pumps, condensing boilers, wood boilers), distribution with buffer storage, heat emission (underfloor heating, radiators, wall heating), hydraulic balancing, control, and integration with photovoltaics or district heating. Correct heat-load calculation per DIN EN 12831, hydraulic balancing (mandatory for funding), code-compliant flue arrangement, and fire safety are essential. Example Germany: requirements follow GEG (65 % renewable share in new builds from 2024), DIN EN 12828, BImSchV (emission limits). Plumbing/heating chamber registration required for gas and water connections.

FAQ

How much does a heating retrofit cost as subcontracted work?

Which system for which building?

Which flow temperatures for which heat emitter?

What is hydraulic balancing?

Which subsidies are available in Germany?

How long does a heating retrofit take?

How much does a heating retrofit cost as subcontracted work?: Example Germany: air-source heat pump for a single-family house 25,000–40,000 € installed incl. equipment and labour, ground-source 30,000–50,000 € (plus boreholes 8,000–15,000 €), condensing gas boiler 8,000–14,000 €, pellet boiler 22,000–35,000 €. Underfloor heating retrofit 50–100 €/m². In Poland typically 30–40 % below German rates.
Which system for which building?: Heat pump: ideal for low-temperature systems (underfloor heating 30–40 °C flow), renovations with envelope insulation. Condensing gas: low capex but GEG-compliant only with renewable share from 2024. Pellet: existing buildings with radiators and higher flow temperatures. Hybrid: heat pump plus gas for long heating seasons.
Which flow temperatures for which heat emitter?: Underfloor heating 30–40 °C, optimal heat pump efficiency. Wall heating 30–35 °C. Low-temperature radiators 45–55 °C, possible with generously sized units. Classic 70/55 °C only in unrenovated existing fabric – poor heat-pump efficiency.
What is hydraulic balancing?: Example Germany: mandatory under §14 GEG for all heating systems. Calculation of required flow rates per room based on heat load, setting thermostatic and balancing valves. Method A (simplified) for existing, method B (room-by-room load) for KfW funding. Reduces energy consumption 5–15 %.
Which subsidies are available in Germany?: Example Germany: BEG-EM (single-measure funding) via KfW – 30–70 % grant for heating replacement depending on income and system (heat pump, solar thermal, pellet higher than gas hybrid). Application before contract is mandatory. Additionally §35c EStG for owner-occupiers.
How long does a heating retrofit take?: Replacing old gas with condensing boiler: 2–3 days for a two-person team. Heat-pump installation with commissioning: 4–6 days. Ground-source with borehole drilling: 7–14 days incl. drilling. Complete heating with underfloor retrofit in a 130 m² house: 3–4 weeks.

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