The Vitovalor PT2, which Viessmann once sold under the name Vitovalor 300-P, is an ideal energy centre for single and two-family homes. As with all CHP units with fuel cells, the electrical efficiency is considerably higher than with conventional CHP units and the heat extraction is lower. This makes the Vitovalor PT2 particularly suitable for buildings with a high energy standard where little amount of warmth is required for space heating.
The device has a thermal power of 1.1 kilowatts. If this is not enough, an integrated peak load boiler switches on. This can have a thermal power of 11.4, 19, 24.5 or 30.8 kilowatts. With the largest peak load boiler, 32,000 kilowatt hours of heat are available per year. Excess heat, in turn, is stored temporarily in a 220-litre storage tank.
The electrical power is 750 watts. This enables the device to produce 18 kilowatt hours of electricity per day, covering the entire electricity requirement of a single or two-family house. It generates a total of 6,228 kilowatt hours of electricity per year. The mathematical 6,570 kilowatt hours it does not achieve, because it does not run completely all the time. In practice, it automatically shuts down for regeneration after 45.5 hours and restarts. This takes 2.5 hours. After that it is available again for 45.5 hours to generate electricity and heat.
The device is designed for the longest possible running times. For this reason, Viessmann has integrated an energy manager that controls the Vitovalor. Via this energy manager, the machine learns the typical load curve of the respective household. It only switches on the Vitovalor when the longest possible running times can be foreseen in one run.
The entire unit, including the heat storage tank, requires a space of 595 x 600 millimetres. The room must be high enough for the unit to fit in at a height of 1.8 metres and can also be installed there. The total weight of the device is 326 kilograms.
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