Heat pumps in older buildings - all information at a glance

There is often talk that a heat pump is only suitable for new construction. But far from it. They can also be used in existing buildings and are worthwhile. Find out here what you should consider if a heat pump is to be installed in an existing building.

Is a heat pump worthwhile in an old building?

Especially when it comes to heat pumps in old buildings or existing buildings, many prejudices have taken root. Many people believe that a heat pump does not work in an old building - especially that it does not run efficiently. This is not true. In principle, the efficiency and effectiveness of a heating system depend on many different factors. This applies to both new buildings and existing ones. Good and detailed planning is therefore the be-all and end-all for successful heating system modernization.

Creating the right conditions for a heat pump in an existing building

A heat pump should always match the building and, above all, the heating habits of the occupants. The consumption of heating energy ultimately determines how the heat pump is to be planned and designed. For this purpose, existing accounts from the past few years can be consulted in advance. When looking at the figures, homeowners can also roughly determine for themselves whether a heat pump is worthwhile. This can reveal how the demand for heating energy can be reduced.

• Is there an opportunity to improve the building's insulation? Can windows, doors, walls and ceilings be insulated?
• Is there an option to replace older radiators with low-temperature radiators or panel heating?
• Can the flow temperature already be lowered with the old system and will the rooms still be adequately heated?

If homeowners can answer these questions in the affirmative, there is almost nothing standing in the way of installing a heat pump in an old building. It should also be ensured that there is sufficient space, especially for the unit outside. You can then plan your new heat pump in consultation with an expert on site.

Are a low flow temperature and underfloor heating mandatory?

No. Modern heat pumps can achieve flow temperatures of 75 degrees Celsius. Even conventional radiators can cope well with this and supply the rooms with heat accordingly. Nevertheless, it pays to replace old radiators. But it doesn't necessarily have to be underfloor heating. Even with low-temperature radiators, the use of a heat pump in existing buildings can make sense. These can handle low system temperatures in the flow of around 35 to 45 degrees Celsius very well. Despite these low flow temperatures, they achieve the same heating effect as the old radiators.