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  • The Heat Pump Sizing Mess: Why Are We Still Getting This So Spectacularly Wrong?

    How Should a Heat Pump Be Serviced? Manufacturers Offer Varying Answers

    Under the Cover: Are Heat Pump Service Contracts Fulfilling Their Promises?

    Why do you have a buffer vessel with a heat pump?

    MarsDec 28, 202117 March 20226
    Do you need a buffer vessel (or buffer tank) with a heat pump. Graham Hendra shares his thoughts on this subject.
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    What is delta T (ΔT)?

    MarsDec 27, 202112 December 20222
    Graham Hendra explains what the mysterious delta T (ΔT) is when it comes to heat pump systems.
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    What is seasonal coefficient of performance (SCOP)?

    MarsDec 26, 202117 March 20220
    Most heat pump owners are familiar with the term coefficient of performance (COP). Graham Hendra explains the difference between COP and seasonal coefficient of performance (SCOP).
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    Is a heat pump sized in the same way as a fossil fuel boiler?

    MarsDec 25, 202117 March 20220
    There is a lot of confusion about heat pump sizing, especially in relation to existing gas or oil boilers. Graham Hendra explains whether heat pumps should be sized on the
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    How can the efficiency of a heat pump exceed 100 percent?

    MarsDec 24, 202117 March 20220
    It’s difficult to understand how a heat pump can have an efficiency of over 100%. Graham Hendra explains how heat pumps are able to achieve these efficiencies.
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    What are the risks of oversizing a heat pump?

    MarsDec 23, 202117 March 20220
    We know that if a heat pump is undersized, this may mean that it will struggle to heat your property, but what are the risks if a heat pump is
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    What is the difference between an EPC certificate and a heat loss calculation?

    MarsDec 22, 202117 March 20220
    Graham Hendra explains what the difference is between an EPC certificate and a heat loss calculation.
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    How does a heat loss calculation help you calculate the size of a heat pump?

    MarsDec 21, 202117 March 20220
    Once you’ve had your heat loss calculation completed, how do you decide on the size of heat pump that you will need to adequately heat your property? Graham Hendra explains.
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    The Graham Hendra Awards

    Graham HendraDec 20, 202120 December 20210
    By now, if you’re a regular reader of my posts, you will know I’m a bit of an egomaniac so it won’t surprise you that I thought I would hold
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    Heat pumps for apartment blocks and whiskey distilleries

    MarsDec 19, 202117 March 20220
    We sat down and had a fascinating chat that was full of insights with Dave Pearson, Group Sustainable Development Director at Star Refrigeration. Dave tells us about how heat pumps
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