Solar support for oil heating

Reduce heating oil consumption: Combining oil heating and solar thermal saves up to 25% energy.

Who combines his oil heating with the sun, can reduce the heating costs by half.

Compared to the old heating system, a new condensing boiler saves about 40% of thermal energy. If you combine the new oil heating with solar energy, you save another 25% on heating costs.

That’s almost 50% savings – with a double benefit: the value of your property also increases with the use of solar thermal energy. The operating costs are minimal.

Obtaining service water solar

60 % of the annual hot water demand of the whole family is covered by a solar system, even in our latitudes with relatively diffuse solar radiation. In summer, solar heat is usually 100% sufficient. You take a solar shower and, depending on the appliance, you can even run your washing machine and dishwasher on solar power. Every modern condensing boiler can be combined with a solar system. More info can be found on our page solar thermal mode of operation.

Solar generation of domestic hot water and heating

Solar plants, which additionally support the old oil heating, save after all a quarter of the entire fuel oil consumption! However, you need enough space for one domestic hot water and one heating buffer tank each, resp. a combi memory.

Legal obligation: replacement of the heating system

Which legal principles apply?

The obligation to replace heating systems from 2020 is enshrined in the new Building Energy Act (GEG) The document combines the Energy Conservation Act (EnEG), the Energy Conservation Ordinance (EnEV) and the Renewable Energies Heat Act (EEWarmeG) to significantly simplify German energy conservation law. The corresponding retrofitting obligation can be found in § 72.

Which heaters are currently (as of 2020) affected?

All boilers with an output of 4 to 400 kilowatts, which:

  • Burn fuel oil, natural gas or liquid gas
  • were installed more than 30 years ago
  • are not based on low or condensing boiler technology

How to tell if my heating is affected?

  • Affected constant temperature boilers were still in operation until the 1980s and can be identified by the fact that they run at the same high heating water temperatures all year round. With newer low-temperature units, the supply temperature can be controlled up or down as desired.
  • The age is usually to be read on the type plate. Alternatively, old invoices, product documents, data sheets or documents from the chimney sweep can be helpful.
  • The unaffected condensing boilers can also be identified by the wastewater connection

What are the alternatives?

New is good, renewable is better, therefore:

What subsidies are available?

For the replacement of a gas heating system with a renewable form of energy, you receive up to 35 percent subsidy. The end of an oil heating system is subsidized with 45 percent of the costs. Applications for subsidies are submitted online via the BAFA website before a specialist company is commissioned.

What are the future developments?

With the climate package, the federal government has also agreed on a ban on oil heating systems in the near future. This concerns the installation of new boilers and is therefore not a heating system replacement obligation. Anyone who has to have a new heat generator installed from 2020 should, however, consider changing the energy source.
From 2026, the installation of an oil-fired condensing boiler is only possible if it is combined with renewable energy sources (e.g., solar energy).B. Heat pump, solar thermal) is operated as a hybrid heating system.

Another reason for replacement: a high replacement premium for old oil heating systems has been available through the Federal Office of Economics and Export Control (BAFA) since 2020. This comes with subsidies of 40 to 45 percent, depending on the new heating system, and is only available if the existing system is not yet affected by the replacement requirement. So anyone who waits too long is giving away high government subsidies!

The ban on oil-only heating systems has already been incorporated into the new Building Energy Act (GEG) and is scheduled to take effect in 2026. It can be found under § 72 "Prohibition of operation of boilers, oil heating systems".

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