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<blockquote data-quote="HatsOff" data-source="post: 7794478" data-attributes="member: 158216"><p>They have immersion heaters so they can run a weekly disinfection cycle to kill any legionnaires bacteria. Heat pumps max out at around 50C and legionnaires needs to be 60C to kill it. Now... With an unvented cylinder using mains water the risk is effectively zero at 50C, but that's just how they're configured in the UK. They won't use those for anything else unless there is a full on breakdown and the user switches it on. In the past, larger properties have any back up boilers (a hybrid system), but they're pretty much no longer needed with newer heat pumps.</p><p></p><p>In freezing conditions the heat pump will reverse cycle to clear any frost. This does reduce the efficiency (and makes a great spectacle with the cloud it produces), but overall they're still cheaper than off grid oil and gas. Even in the -10C weather it was maxing out at approx £6/day to run - less than oil was costing me before. Not cheaper than mains gas, though.</p><p></p><p>Edit - massive caveat. The problems and 'horror stories' are when a house is poorly insulated/draughty so the heat pump can't deliver enough heat to warm it up. But in a well designed system, great!</p></blockquote><p></p>
[QUOTE="HatsOff, post: 7794478, member: 158216"] They have immersion heaters so they can run a weekly disinfection cycle to kill any legionnaires bacteria. Heat pumps max out at around 50C and legionnaires needs to be 60C to kill it. Now... With an unvented cylinder using mains water the risk is effectively zero at 50C, but that's just how they're configured in the UK. They won't use those for anything else unless there is a full on breakdown and the user switches it on. In the past, larger properties have any back up boilers (a hybrid system), but they're pretty much no longer needed with newer heat pumps. In freezing conditions the heat pump will reverse cycle to clear any frost. This does reduce the efficiency (and makes a great spectacle with the cloud it produces), but overall they're still cheaper than off grid oil and gas. Even in the -10C weather it was maxing out at approx £6/day to run - less than oil was costing me before. Not cheaper than mains gas, though. Edit - massive caveat. The problems and 'horror stories' are when a house is poorly insulated/draughty so the heat pump can't deliver enough heat to warm it up. But in a well designed system, great! [/QUOTE]
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