How many compressor starts per year

MikeF · 2025-04-04T16:57:00Z

We have a Veissmann heat pump with a 7 year warranty, when it had its annual service i asked the engineer how many hours we could expect the compressor to last before needing replacing. His answer was that the number of starts, not hours run, was normally the limiting factor, with the Veissmann unit tested to 20,000 starts before potential problems. After 3 years we are at 6,400 hours and 13,000 starts, so expect to get to the 20,000 in its 5th year, long before the warranty runs out. How many starts per year are other pumps averaging? and are people having problems after 20,000?

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Air Source Heat Pumps (ASHPs)

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GC61

(@gc61)

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07/04/2025 12:41 pm

@editor @mikef For Comparison I have a Viessmann Vitocal 151-A which will have been installed 2 years next month. So far... Compressor Hours 5804 and Compressor Starts 3579. On that basis I should reach 20000 starts in c.11 years. I've no idea whether these numbers are good or bad. I asked the service engineer about it last year and he mumbled something to the effect that as long as the number of Compressor Starts is less than the number of Compressor Hours then I'm doing ok!

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MikeF

(@mikef)

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Topic starter 07/04/2025 6:48 pm

@gc61 Less that one start per hour is very good, our pump can manage that when its cold, but it cant modulate down low enough in Spring and Autumn, even with a 9 hours setback.

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