Customer-specific heat pump systems with patented direct condensation from the Erzgebirge region
LERCHNER Alternative Heizsysteme GmbH
Mildenau (DE)New on Amplifa
About LERCHNER
LERCHNER Alternative Heizsysteme GmbH develops and produces customer-specific heat pump systems in Mildenau in the Erzgebirge region for housing associations, industry and commerce, public institutions and private customers. The systems operate on the principle of direct condensation: the heated refrigerant (hot gas) is routed directly into copper coils in the buffer tank, which thereby serve as a large heat exchanger. This eliminates an external heat exchanger, reduces heat losses and, under optimal conditions, lowers energy consumption by around 20 percent compared with standard heat pumps. The patented use of hot gas also enables hygienic domestic hot water preparation in a flow-through principle without an additional drinking water tank. Production is carried out in small series and order-related one-off production, with output and tank size adapted to the respective conditions. The product range comprises nine sizes (WPS 1-7 to WPS 1-54) with outputs from 7.2 to 54.8 kW (B0/W35). The company is prepared for smart grids and offers remote maintenance via LAN as well as service and maintenance.
- Site
- Mildenau
- Processes
- Customer-specific production / small series of heat pump systems (customer-specific), Heating and plumbing services / installation of heat pump systems, Customer-specific production of heat pumps (output and tank size), Small-series and one-off production, Remote maintenance via LAN, Service & maintenance, Subsidy consulting (BAFA special designs, KfW), Assembly manuals and support
- Materials
- Copper, Stainless steel, Stainless steel corrugated tube, EPDM pipe, Refrigerant R 407C, Glycol mixture (brine), Stainless steel / stainless steel corrugated tube
- Certificates
- EC Declaration of Conformity
- Founded
- 1999
- Industries
- Housing associations & neighborhoods, Industry & commerce, Public institutions (schools, kindergartens, churches), Private customers, Housing associations
- 01
Engineering and design of the heat pump systems
- 02
Customer-specific production in small series and one-off production
- 03
Assembly of the components (compressor, heat exchanger, tank)
- 04
Testing in accordance with EN 14511
- 05
Delivery, installation by skilled personnel
- 06
Remote maintenance via LAN, service & maintenance
Materials & System Technology
Copper
In direct condensation, the copper coils in the buffer tank serve as heat exchangers.
Stainless steel / stainless steel corrugated tube
Corrosion-resistant materials for pipes and flow-through domestic hot water preparation.
EPDM pipe
Plastic pipe for buffer and drinking water lines in the system structure.
Refrigerant R 407C
Working medium of the heat pump systems, fill quantities of 3.6 to 19.86 kg depending on size.
Glycol mixture (brine)
Heat transfer fluid in the brine circuit for connecting the heat source.
Locations
Mildenau
DEHead office with production (production hall since 2025)
- Part weight / size
- Unit weight 235–485 kg, standard dimensions 110 x 245 x 155
- Lot size
- One-off production to small series
- Materials
- Copper, stainless steel, EPDM, refrigerant R 407C
Heat Pump Systems
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Customer-specific production / small series of heat pump systems (customer-specific)Assembly | – | – | – | 1 piece (one-off production) – Small series | Copper, Stainless steel, Plastic (EPDM pipe), Stainless steel corrugated tube |
| Heating and plumbing services / installation of heat pump systemsAssembly | – | – | – | – | Copper, Stainless steel, Plastic |
Additional services
Quality
The heat pumps are built according to the current state of the art and generally recognized safety rules; outputs are specified in accordance with EN 14511. A digital assembly manual and an EC declaration of conformity are available.
| Evidence | Mildenau |
|---|---|
| EC Declaration of Conformity |
Company History
- 1999
Foundation of the sole proprietorship Jörg Lerchner – Alternative Heizsysteme as a heating and plumbing business in the GDZ Annaberg-Buchholz
- 2006
Development of the first own heat pump (Gen 1) by the certified HVAC technician
- 2021
Jörg Lerchner and TKI mbH in Chemnitz meet
- 2024
Partnership with TKI mbH
- 2025
Conversion to GmbH; expansion of the first large production hall
- 2026
Introduction of digitalization processes