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That is a manufacturer-reported result for a stated test, not a seasonal performance factor, not shown as a Navien PEM750 test, and not a bill cut. If the same heat is delivered, a 17% rise in COP cuts that electricity to about 1 divided by 1.17 of the previous figure, roughly 14.5%, and only for the load the test actually changed. Standing charges, other household electricity, hot water and backup heat can shrink that further, so no national bill saving should be inferred." } }, { "@type": "Question", "name": "What is the difference between COP, SCOP and SPF?", "acceptedAnswer": { "@type": "Answer", "text": "A point COP is heat delivered divided by electricity at one condition. A seasonal coefficient of performance, or SCOP, is a standardised laboratory seasonal rating, not a reading from your house. A seasonal performance factor, or SPF, is in-use performance over a season, and the boundary may or may not include pumps, controls, defrost and backup heat. The announcement does not present the 17% figure as an SPF, or as a SCOP for the PEM750." } }, { "@type": "Question", "name": "Has the Energy Saving Trust test been published so I can check it?", "acceptedAnswer": { "@type": "Answer", "text": "The public announcement, as described, does not reproduce an Energy Saving Trust test note, protocol, dataset or a link a buyer can check. It is also unclear whether the test used a Navien PEM750 or another heat pump running ecoHeat. Under UK advertising rules, including the CAP Code overseen by the Advertising Standards Authority, a performance claim needs evidence a reader can examine. Until Navien, Passiv or Energy Saving Trust publish that note, ask for it in writing rather than treating installer coverage of the partnership as independent consumer evidence." } }, { "@type": "Question", "name": "What does the Navien and Passiv package actually include, and from when?", "acceptedAnswer": { "@type": "Answer", "text": "From 1 October 2026, Navien’s PEM750 air-source heat pump can be supplied with the Passiv Smart Thermostat as an integrated package, available through selected merchants. That is not a confirmed national roll-out to every installer, and the public announcement does not list which PEM750 variants are included. Passiv says the control adjusts flow temperatures and schedules running around time-of-use tariffs and surplus rooftop solar, without extra interface hardware, and that installers get remote monitoring and diagnostics through the Passiv Portal. Price, installed cost and measured seasonal performance for this package are not stated, so they should not be assumed." } }, { "@type": "Question", "name": "Will smart control replace weather compensation and MCS commissioning?", "acceptedAnswer": { "@type": "Answer", "text": "No. Weather compensation raises flow temperature in colder weather and lowers it when it is milder, because COP falls as the temperature lift increases. Dynamic optimisation, as Passiv describes it, keeps adjusting that relationship instead of leaving one curve untouched, but it does not remove site checks. For a UK installation under the MCS heat pump standard, currently the MIS 3005 family, the design is expected to rest on a room-by-room heat-loss calculation and emitter outputs at the intended flow temperature. A portal does not calculate heat loss, and software cannot resize a radiator or make an undersized heat pump deliver the design load." } }, { "@type": "Question", "name": "When do solar surplus and time-of-use scheduling actually help?", "acceptedAnswer": { "@type": "Answer", "text": "They help only if the home has that tariff or generation, and if it can store heat in the building, cylinder or buffer without comfort complaints. Pre-heating a well-insulated house on a time-of-use tariff can be sensible; the same shift in a leaky house with small radiators often shows up as a cold evening and a recovery spike. Surplus solar is intermittent and seasonal, and use is limited by cylinder limits, legionella schedules and the heat pump’s minimum run times. Homes without solar, without a time-of-use tariff, or without reliable internet will not get this part of the package." } }, { "@type": "Question", "name": "Does this launch change Boiler Upgrade Scheme eligibility or grant value?", "acceptedAnswer": { "@type": "Answer", "text": "No. Grant schemes such as the Boiler Upgrade Scheme have their own eligibility rules, often including an MCS-certified installation. This pairing does not, on the published material, set the grant value, change eligibility, or remove that requirement where the scheme imposes it. Check current scheme terms rather than reading a control launch as a grant update. The announcement is also a domestic control story, not a guide to commercial renewable systems." } }, { "@type": "Question", "name": "What is the Greener Grid Payment, and should I include it in a payback calculation?", "acceptedAnswer": { "@type": "Answer", "text": "Passiv’s Greener Grid Payment lets enrolled customers shift heat-pump consumption during periods of network constraint. It is optional and separate from the thermostat pairing. Rates, minimum shift, eligibility and opt-out rules are not in the public material, so any income should be treated as unknown until the scheme terms are in writing. Do not put a payment into a payback sum when the rate has not been published, and do not accept a heat pump that cannot meet the design heat loss on a cold day just because a flexibility payment exists." } } ], "about": { "@id": "https://kilowatts.uk/resources/new-uk-smart-heat-pump-control-claims-17-efficiency-improvement/#content" } }, { "@type": "WebPage", "@id": "https://kilowatts.uk/resources/new-uk-smart-heat-pump-control-claims-17-efficiency-improvement/#webpage", "url": "https://kilowatts.uk/resources/new-uk-smart-heat-pump-control-claims-17-efficiency-improvement/", "encoding": [ { "@type": "MediaObject", "encodingFormat": "text/markdown", "contentUrl": "https://kilowatts.uk/resources/new-uk-smart-heat-pump-control-claims-17-efficiency-improvement.md" }, { "@type": "MediaObject", "encodingFormat": "application/ld+json", "contentUrl": "https://kilowatts.uk/resources/new-uk-smart-heat-pump-control-claims-17-efficiency-improvement.schema" } ], "name": "New UK Smart Heat-Pump Control Claims 17% Efficiency Improvement", "headline": "New UK Smart Heat-Pump Control Claims 17% Efficiency Improvement", "description": "Navien and Passiv’s PEM750 package claims a 17% COP gain from smart control. 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