Are you a homeowner?
Use your savings potential now
Are you a homeowner?
Use your savings potential now
Are you a homeowner who has invested several thousand euros in your new and efficient heating system and would like to reduce your energy costs in the long term?
But you are still wasting valuable energy because your system is not fully insulated?
Would you like to meet your obligations under the GModG (Building Energy Act) and avoid having to report defects when the heating system is inspected (for new installations) or as part of the fireplace inspection (every 3 1/2 years) by the chimney sweep (GModG §97 Para. 1 and 2)?
What do you need to consider?
Since 29 July 2026, the former Building Energy Act (GEG) has been known as the Building Modernisation Act (GModG).
The Act is intended to help reduce energy consumption and greenhouse gas emissions from buildings and to improve energy efficiency in the building sector. It also sets out requirements for the insulation of heat distribution and hot water pipes as well as fittings and valves.
Who is responsible?
Under Section 8 GModG, responsibility for complying with the statutory requirements generally lies with the building owner or developer. Commissioned specialist companies and individuals may also bear responsibility within their respective area of activity.
Heat Distribution and Hot Water Pipes and Fittings
(1) If heat distribution and hot water pipes and fittings are installed in a building for the first time or are replaced, the building owner or property owner must ensure that the heat emission from the pipes and fittings is limited in accordance with Appendix 8.
(2) The owner of a building must ensure that the heat emission from previously uninsulated, accessible heat distribution and hot water pipes that are not located in heated rooms is limited in accordance with Appendix 8.
(3) In the case of a residential building with no more than two apartments, one of which the owner was personally occupying as of February 1, 2002, the obligation under paragraph (2) shall be fulfilled by the new owner only in the event of a change of ownership occurring after February 1, 2002.
(4) The deadline for fulfilling the obligation under paragraph 3 is two years from the first transfer of ownership after February 1, 2002.
Violations may be subject to fines
(1) A person commits an administrative offense if, intentionally or recklessly (…), in violation of § 69(1) or (2) or § 70, they fail to ensure that the heat output or heat intake of the pipes or fittings specified therein is limited, (…),
(2) The administrative offense may be punished in the cases specified in paragraph 1, items 1 through 3 and 12 through 14, with a fine of up to fifty thousand euros; in the cases specified in paragraph 1, items 15 through 22, with a fine of up to ten thousand euros; and in the remaining cases specified in paragraph 1, with a fine of up to five thousand euros.
Valves in the boiler room are not insulated
High energy loss!
Valves and pipes according to specifications
of the GModG 2026
No energy loss!
Hot water installation in an uninsulated state. Due to the flow resistance, the greatest heat loss occurs at the valve, as the hot water temperature drops more here due to the resistance of the pipe and the changing flow conditions. This effect can be considerable, particularly with longer pipe runs or inadequately insulated pipes, and can lead to unnecessary energy loss.
The use of vela[clip] reduces heat loss at the valve to a minimum. The innovative system ensures that heat is retained more efficiently in the pipe system by minimizing thermal bridges at critical points such as the valves. With vela[clip]'s specially developed technology, the insulation is applied directly at the source of the heat loss, keeping the temperature of the transported hot water constant over longer distances.
Holistic thermal insulation and cold insulation in accordance with the German Building Energy Act (GModG) and DIN 1988 ensures efficient use of energy and a reduction in heat and cold losses throughout the entire pipe system. The consistent application of these standards not only minimizes heat loss at critical points such as valves and connections, but also optimizes the building's entire heating and cooling technology.
