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2012 Heat Pump Cost Summary

My Hitachi Yutaki heat pump has been running for a year now. Here is a summary of the running cost and comparison with the previous couple of years when all heating was electric storage heaters/fan heaters. First the basic data, costs are approximate, based on last years figures as entered in the imeasure website which […]

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Effect of Hitachi Heat Pump over-heat

I noted earlier (see this post) that the Hitachi Yutaki Air Source heat pump has a design flaw. By only sampling the control signal every 20 minutes, it is perfectly possible to start heating water with a setpoint of maybe 55°, run for several minutes, and then attempt to raise the entire space-heating circuit to […]

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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 […]

Read: Hitachi Yutaki Heat Pump: Hot Water – Broken by design

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