Produce energy and cost savings there are different types of CHP. The most internal combustion engines are powered by natural gas. This mini cogeneration plants used in the United States and Japan already thousands of times. From summer, these can be purchased in Germany. The principle of combined heat and power is used by many manufacturers – Vaillant, Viessmann, August Brotje, Remeha, OBOT, Badger. For Mehrfamilenhausern with high energy demand, there are these systems for several years. However, listings for single-family homes were missing so far.
The self-produced electricity homeowners themselves can consume or feed it into the net. A CHP with one kilowatt (kW) electrical power produced in the year 5500 kilowatt hours (kWh) of electricity. Homeowners should buy this amount of electricity at a cost of 20 cents/kWh for around 1100 euros at the power company. With a CHP, you can consume half of the power itself, and sell the rest to the power exchange. Thanks to the power-heat-coupling law of power over ten years will promoted with 5.11 cents / kWh. Since the current must not be bought one saves 2.05 cents per kilowatt hour. At the end of this constitutes good and like 500 to 600 euros per year in savings”, says Muller.
In relation to an old boiler save 30 percent energy costs with a gas heater with engine.” To cover the peak load to weddings, households need a boiler that is built for smaller CHP plants often already in the unit. But even the old boiler can be used in case of doubt. However, there are also negative factors. The purchase price of a mini-CHP is about 16,000 to 20,000 euros. A boiler would hit with maximum 10,000 euros. In addition, the maintenance costs are significantly higher. Consumer centres therefore recommend a thorough calculation of both systems. A block heat and power plant is worthwhile only if it was at least 4,500 hours in the year. It is also cheaper to consume the electricity itself. Yet the specialists agree: the classic oil or Gas heating systems are not replaced this safely.” However, it is a real step to produce its current itself. This one is independent and can save money in the future. However, you bought this freedom with a high investment. The cost should be calculated at least before buying a House.