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Good practices in CP: 53. Modernization of the DHW system by implementing a heat pump (S&S Projekt)

Written By Polski Ruch Czystszej Produkcji on czwartek, 27 października 2022 | 10:30

photo by: S&S Projekt


Good practices and investments related to Cleaner Production

Example No. 53
Modernization of the DHW system by implementing a heat pump

Sławomir Mohr Firma Handlowo-Usługowa “S&S Projekt”, Gronowo Górne

Industry branch: furniture industry
Main products: lacquered furniture fronts, furniture components

Resources in question:

  • Electrical energy
  • Thermal energy
Pollution, waste in question:
  • Emissions into the atmosphere (indirectly)
Cost (implementation of good practice): Medium
(PLN 12,250 net, including the purchase of a heat pump with a 300-liter tank: PLN 9,250 net; pump installation: PLN 3,000 net)

Description of the problem:

Domestic water is used in the company's social space, divided into three zones:

  • main office and dining room
  • women's changing room
  • men's changing room

In each of the aforementioned 3 zones there was one 100-liter boiler for heating domestic hot water (DHW) with an electric heater. These boilers were designed to maintain a certain temperature of hot water at a constant level, but the layout of these devices was unfavorable, i.e. the water often turned out to be insufficiently warm in some areas and too warm in others. The use of these devices also resulted in high electricity consumption.
The company therefore decided to change it to a more modern, environmentally friendly and economical system.

Applied solution:
Analyzing the market and the latest trends, it was decided to purchase a heat pump for DHW. Important arguments included the high efficiency of this technology and the ability to heat cold water to the temperature expected at the company of 55oC.
Eventually, a standing heat pump with R134A refrigerant was selected, which is characterized by, among other things, high efficiency, quiet operation, and the so-called PV system – allowing easy connection to a photovoltaic installation, which is one of the options being considered for implementation by the company in the future.
It was decided to install the unit with a 300-liter tank and an additional coil for connecting central heating, which will provide an additional (peak) heat source during the shift period – when the company's own wood waste incinerator is operating to provide heat for central heating. A single, large tank also made it possible to better distribute hot water (according to the needs of employees, without significant temperature differences between zones).

Obtained benefits and effects of the implementation:

  • Reduction in electricity consumption by about 3,750 kWh/year (i.e., by about 47%), which translates into lower impacts of energy production, including emissions (including CO2 – estimated reduction: by about 2.6 Mg/year)
  • Savings from lower electricity charges for heating domestic hot water in the enterprise: about PLN 2430 net/year (maximum payback period: about 5 years), but from a practical point of view, the financial result is expected to be much better

Old boilers with electric heaters
photo by S&S Projekt

 New heat pump
photo by S&S Projekt

  • Report on the Cleaner Production Project No. 7ind.789, developed within the framework of the Cleaner Production Academy at FHU "S&S Projekt": "Reduction of stretch film consumption in the process of internal transport"
  • Materials (including photos) submitted by FHU "S&S Projekt"


Polish version:

This material has been subsidized by the National Fund for Environmental Protection and Water Management. The Polish Cleaner Production Movement Association is solely responsible for its content.


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