Archives » July, 2012

Hitachi Yutaki Heat Pump: Hot Water – Broken by design

As identified earlier in this post, my heat pump is not following it’s control settings for hot water heating, resulting in it using more power than expected. Coupled with the high standby power load, this results in an efficiency for water heating not much better than direct electric heating, and may well be contributing the the overall […]

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Heat pump running costs – Hitachi Yutaki ASHP

So, the heat pump installation detailed here has been running for 6 months now, and it is probably reasonable to present some comparative data against what I had before, 4 storage heaters and an old poorly insulated immersion cylinder, plus an electric shower. I don’t have good detailed data for the previous years, just my utility […]

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Heat Pump – not so good for water heating

OK, here goes for a fairly complex posting. My Air-Source heat pump has been running for 6 months or so now, with a few glitches like a blown fuse (inside the unit) and initial teething problems which seem to stem from the heat supply being quite high in comparison to the load provided by at […]

Read: Heat Pump – not so good for water heating

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