--- title: "Heat Pump Upgrades & Retrofits Hampshire | Appian" description: "Heat pump system upgrades and retrofits across Hampshire. Improve performance, upgrade emitters, retrofit underfloor heating. Call 07481 552059." lang: en-GB json-ld: | [ { "@context": "https://schema.org", "@type": "Service", "name": "Heat Pump System Upgrades and Retrofits", "description": "System upgrades and retrofits for existing heat pump installations across Hampshire and surrounding areas.", "provider": { "@type": "LocalBusiness", "name": "Appian Heat Pumps", "telephone": "+447481552059", "address": { "@type": "PostalAddress", "streetAddress": "12 Appian Way, Chineham", "addressLocality": "Basingstoke", "addressRegion": "Hampshire", "postalCode": "RG24 8BH", "addressCountry": "GB" } }, "areaServed": [ "Basingstoke", "Hampshire", "Berkshire", "Surrey", "Wiltshire" ] }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Do I need to replace my heat pump to improve performance?", "acceptedAnswer": { "@type": "Answer", "text": "Not usually. In most cases, upgrading the emitters, hot water cylinder, or controls around your existing heat pump delivers a bigger improvement than replacing the unit." } }, { "@type": "Question", "name": "How much do system upgrades cost?", "acceptedAnswer": { "@type": "Answer", "text": "Costs vary depending on the scope. Individual radiator replacements start from around £300 per unit installed. Full system upgrades including emitters, cylinder, and controls are quoted on a project basis after assessment." } }, { "@type": "Question", "name": "How much can I save on energy bills?", "acceptedAnswer": { "@type": "Answer", "text": "Reducing flow temperature from 55°C to 40°C typically improves COP by 40–60%, which translates directly to lower electricity consumption. Exact savings depend on your property and current system configuration." } }, { "@type": "Question", "name": "Can upgrades be done in stages?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We can prioritise the highest-impact upgrades first and phase remaining work over months or years. Each stage delivers measurable improvement." } }, { "@type": "Question", "name": "Will I need to drain my heating system?", "acceptedAnswer": { "@type": "Answer", "text": "Most radiator and hydraulic upgrades require a partial or full drain-down of the heating system. We manage this efficiently and refill with appropriate inhibitor treatment." } }, { "@type": "Question", "name": "Do you retrofit underfloor heating?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We install wet underfloor heating in existing properties, typically at low profile to minimise floor height increase. This is ideal for extensions, renovations, and ground-floor living spaces." } }, { "@type": "Question", "name": "What is the payback period for upgrades?", "acceptedAnswer": { "@type": "Answer", "text": "Most upgrade packages pay for themselves within 3–5 years through reduced electricity bills. High-impact upgrades like cylinder replacement can pay back in under 2 years." } }, { "@type": "Question", "name": "What areas do you cover?", "acceptedAnswer": { "@type": "Answer", "text": "We cover Hampshire, Berkshire, Surrey, Wiltshire and surrounding areas including Basingstoke, Reading, Winchester, Guildford, and Newbury." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.appianheatpumps.com/" }, { "@type": "ListItem", "position": 2, "name": "Services", "item": "https://www.appianheatpumps.com/services" }, { "@type": "ListItem", "position": 3, "name": "Heat Pump System Upgrades and Retrofits" } ] } ] --- [ Special Offer Air Conditioning Fully Installed from £1,100 → ](/contact) 12 Appian Way, Chineham, Basingstoke, RG24 8BH Fastest reply → [07481 552059](tel:07481552059)| [01256 672332](tel:01256672332) [![Appian Heat Pumps](/assets/logo-DXHDe5EY.png)](/) Services Service Areas [About](/about)[Our Work](/our-work)[Blog](/blog)[Reviews](/reviews)[Contact](/contact) Call now — fastest reply [07481 552059](tel:07481552059)[Landline: 01256 672332](tel:01256672332) [Request Estimate](/contact) [Call 07481 552059 Fastest reply ](tel:07481552059)[Get Estimate](/contact) ![Heat pump system buffer tank and circulation pump arrangement in utility room upgrade](/assets/work-35-l9yRXuDs.jpeg) 1. [Home](/) [Services](/services) Heat Pump System Upgrades and Retrofits # Heat Pump System Upgrades & Retrofits in Hampshire Upgrade your existing heat pump system to deliver the performance it should have from the start — better emitters, smarter controls, and measurably lower running costs. - Free, no-obligation home estimate - Fixed prices — quote stands, no surprises - Same-week repairs on most callouts [Get my free estimate →](#enquiry)[or call 07481 552059 ](tel:07481552059) Rated 5.0 by Hampshire homeowners · [read reviews](/reviews) 15+ years in HVAC. Specialist in retrofitting and upgrading underperforming heat pump installations. ## Tell us what you need Quick form, real human reply — usually within a couple of hours. 15+ Years Experience F-Gas Certified Hampshire & Surrounding Areas Emergency Callouts ![REFCOM F-Gas Certificated](/assets/refcom-badge-Bo6YwTLs.png)![Mitsubishi Electric Accredited Installer](/assets/mitsubishi-badge-e1lhTUMA.jpg)![Ecodan Renewable Heating Technology](/assets/ecodan-badge-DKEvMTX0.jpg) ## Recent Heat Pump System Upgrades and Retrofits Work A snapshot of jobs we've recently completed across Hampshire and surrounding areas. ![Mitsubishi Ecodan air source heat pump installed on concrete plinth outside a residential property in Hampshire](/assets/work-1-yCIVMH7-.jpeg) ![Split air conditioning outdoor condenser unit mounted on wall brackets at a domestic property](/assets/work-2-BWDRpBxC.jpeg) ![Completed heat pump installation showing outdoor unit with neatly routed pipework and electrical connections](/assets/work-3-B5RieGsd.jpeg) ![Air source heat pump positioned in rear garden with anti-vibration mounts and condensate drain](/assets/work-4-B-xosteY.jpeg) ![Domestic air conditioning wall-mounted indoor unit installed in a living room](/assets/work-4-B-xosteY.jpeg) ![Multi-split outdoor air conditioning unit serving multiple indoor zones at a Hampshire home](/assets/work-6-BtOxm4y4.jpeg) ## What This Service Covers Heat pump system upgrades and retrofits cover the improvement of existing heat pump installations that are not performing to their potential. This might involve upgrading radiators to work at lower flow temperatures, adding underfloor heating to key rooms, replacing an inadequate hot water cylinder, or reconfiguring the hydraulic layout for better efficiency. Many heat pump systems installed during the early adoption period — or fitted quickly under government incentive deadlines — were installed with compromises. Standard radiators were left in place, weather compensation was not configured, and hot water cylinders designed for boilers were reused. These systems work, but they work inefficiently. This service is for homeowners who want to improve their existing heat pump system without replacing the heat pump itself. In many cases, upgrading the components around the heat pump — the emitters, controls, and hot water system — delivers a bigger improvement than replacing the unit. Craig Ball's extensive experience in commissioning and optimising underperforming systems means he can identify exactly which upgrades will deliver the most impact for your specific installation. ## What Happens If You Wait? A heat pump running at 55°C flow temperature because the radiators are too small has a COP of around 2.0 — meaning you pay for 1kW of electricity to get just 2kW of heat. The same heat pump running at 35°C with correctly sized emitters achieves a COP of 3.5–4.0, nearly doubling your efficiency. Many homeowners were told their existing radiators would be fine. Technically they might heat the house, but only by running the heat pump at high flow temperatures that eliminate the efficiency advantage over a gas boiler. An old or undersized hot water cylinder with a small coil surface area forces the heat pump to run at higher temperatures for longer to heat your water. This is one of the most common but easily fixable causes of high running costs. Without smart controls or proper zoning, your heat pump heats your entire house to the same temperature at all times — wasting energy on rooms that are unoccupied or need different temperatures. ## How We Work 1 ### System Review We assess your current installation, identify the specific components limiting performance, and calculate the expected improvement from each potential upgrade. 2 ### Upgrade Proposal You receive a clear proposal detailing recommended upgrades, expected cost savings, and the payback period for each investment. 3 ### Scheduled Installation Upgrade work is carried out with minimal disruption. We can phase upgrades over time if budget requires. 4 ### Recommissioning After any upgrade, we recommission the entire system — adjusting flow rates, weather compensation, and controls to take full advantage of the new components. 5 ### Performance Verification We measure post-upgrade performance and compare against baseline to confirm the expected improvements. ## Why It Matters ### Lower Running Costs Reduced flow temperatures mean a higher COP — translating directly to lower electricity bills. ### Improved Comfort Correctly sized emitters heat rooms more evenly and maintain temperature more consistently. ### Extended System Life A heat pump running within its optimal parameters wears less quickly, extending its operational lifespan. ### No Need to Replace the Heat Pump In most cases, the heat pump itself is fine — it is the surrounding system that needs upgrading. ### Phased Investment Upgrades can be prioritised and completed in stages, spreading the cost over time. ### Measurable ROI We document performance improvements so you can see the return on your investment. ## Technical Detail & Expertise Radiator upgrades are the most common retrofit we carry out. We calculate the required output for each room at the target flow temperature (typically 35–45°C) and specify replacement radiators that meet this requirement. Double-panel, double-convector (Type 22) or larger radiators are often needed, or in some cases, fan-assisted radiators that deliver high output from a compact size. Underfloor heating retrofits are increasingly popular as a complementary emitter to existing radiators. Wet underfloor heating running at 30–35°C is ideally matched to heat pump flow temperatures and provides excellent comfort in living rooms, kitchens, and bathrooms. Hot water cylinder upgrades involve replacing a standard boiler cylinder with one designed for heat pump use. Heat pump cylinders have larger coil surface areas (typically 3–4 m²) to transfer heat efficiently at lower flow temperatures. This reduces reheat times and minimises immersion heater usage. Hydraulic modifications may include adding or resizing a buffer tank, installing a low-loss header, adding zone valves for better control, or reconfiguring pump arrangements. The goal is always to ensure the heat pump operates within its designed flow rate range across all operating conditions. Control upgrades range from simple programmable thermostats to smart zoning systems that learn your schedule and adjust heating accordingly. Weather compensation sensors can be added or relocated for more accurate readings. Smart thermostats with heat pump-specific algorithms (such as Homely or Vaillant's myVAILLANT) can further improve efficiency. For properties with older heat pumps approaching end of life, we advise on whether upgrading components around the existing unit is worthwhile, or whether a system-wide replacement with a newer, more efficient heat pump is the better investment. ### Related Services - [Commissioning & Optimisation](/services/commissioning-optimisation) - [Heat Pump Installation](/services/heat-pump-installation) - [Smart Thermostat Integration](/services/smart-thermostat-integration) - [Health Checks & Performance Reports](/services/health-checks) - [← Back to Homepage](/) ### Service Areas - [Basingstoke](/areas/basingstoke) - [Hampshire](/areas/hampshire) - [Reading](/areas/reading) - [Guildford](/areas/guildford) ## Frequently Asked Questions ### Do I need to replace my heat pump to improve performance? ### How much do system upgrades cost? ### How much can I save on energy bills? ### Can upgrades be done in stages? ### Will I need to drain my heating system? ### Do you retrofit underfloor heating? ### What is the payback period for upgrades? ### What areas do you cover? ## Get More From Your Existing Heat Pump Targeted upgrades that deliver measurable efficiency gains. Book your system review today. [Request a Free Estimate](/contact)[Call 07481 552059](tel:07481552059) Most enquiries responded to within 2 hours ![Appian Heat Pumps](/assets/logo-DXHDe5EY.png) Expert heat pump installation, repair & servicing across Hampshire and surrounding areas. Over 15 years of trusted experience. 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