In recent years, many new homes in the UK have standardised heat pumps as part of their configuration, and numerous households have replaced their existing gas water heaters with government subsidies. However, the issue arises when many individuals, after installation, remain on standard electricity tariffs and continue to operate under the habits established during the gas era. Consequently, their electricity bills appear more expensive than when they used gas, leading to doubts about the cost-effectiveness of heat pumps. This is not a problem inherent to the heat pumps themselves, but rather a result of incorrect tariff choices and operational methods. By selecting the appropriate time-of-use tariffs and adjusting the operational timings of the heat pumps, the cost structure can be completely rewritten.<\/p>\n\n\n\n
The reasoning is quite straightforward. The actual energy efficiency of heat pumps during heating can often reach three to four times that of gas water heaters; in other words, the same unit of electricity can yield three to four units of heat. When combined with time-of-use tariffs, the price advantage becomes significant. For instance, with Octopus Intelligent Go, off-peak hours typically run from 23:30 to 05:30, with rates as low as 7p\/kWh, while other periods can soar to 29.5p\/kWh, a difference of over four times. By scheduling major electricity consumption during off-peak hours, many users can reduce their average electricity price to below approximately 15p\/kWh, resulting in the actual cost of using heat pumps being roughly half that of gas water heaters.<\/p>\n\n\n\n
Starting with hot water settings, during off-peak tariff periods, the target temperature for hot water can be set to 52\u00b0C, allowing the heat pump to heat an entire tank of water at the cheapest rate. During normal or peak periods, the target temperature can be lowered to 48\u00b0C, serving merely to maintain warmth rather than reheat. This ensures that the most energy-intensive part of the process almost entirely avoids high electricity price periods.<\/p>\n\n\n\n
For heating, the ground floor living and dining areas can be regarded as the main heat storage zones for the entire house, as these spaces typically have larger volumes and the highest thermal capacity in their walls and floors. The settings can be quite simple: set the TRVs of all radiators on the ground floor to 5, allowing these areas to absorb heat fully when needed; while bedrooms and other rooms can be set to 2 or 3 to limit temperature rises at night, avoiding sleep disturbances. Simultaneously, during off-peak hours, the target room temperature for the entire house can be set to 23\u00b0C, compelling the heat pump to operate intensively and ‘charge’ the house with heat; during other periods, the target temperature can be lowered to 19\u00b0C, allowing the stored heat to gradually release, thus reducing the need to restart the heat pump during the day or morning.<\/p>\n\n\n\n
Under this usage, there is no need to overly fixate on COP or SCOP. While these metrics are certainly important for comparing equipment, the differences in electricity prices often prove more decisive on actual bills. When off-peak rates are significantly lower than during other periods, allowing the heat pump to operate as much as possible during cheaper times, even at the cost of slight efficiency losses, the overall costs remain lower. For heat pump users, as long as they select the right tariffs and use the right timings, heat pumps will often be a far superior choice compared to gas water heaters.<\/p>\n","protected":false},"excerpt":{"rendered":"
The efficiency of heat pumps is closely tied to electricity pricing. By optimizing operational timings, users can significantly reduce costs, often making heat pumps cheaper than gas water heaters.<\/p>\n","protected":false},"author":2,"featured_media":2050,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false},"categories":[83],"tags":[],"class_list":["post-2051","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-infrastructure"],"yoast_head":"\n