HEAT PUMP INSTALLATIONS
Air Source Heat Pump Installations in Portsmouth, Southampton & the South Coast
Dv Plumbing and Gas Services designs and installs air-to-water heat pump systems across Portsmouth, Southampton, Fareham, Waterlooville, Havant, and Chichester — with a full property assessment before anything goes on order.
If you're ready to move away from gas or replace an ageing heating system, the first step isn't choosing a heat pump. It's finding out whether your property is genuinely suited to one — and getting the system design right so the installation actually works.
Air Source Heat Pump Installation in Portsmouth — Quick Overview
An air source heat pump installation involves replacing or supplementing a gas or oil-fed heating system with an air-to-water heat pump that extracts heat from outdoor air and transfers it to your central heating and hot water. Key facts for Portsmouth homeowners:
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System type covered here: Air-to-water heat pumps for domestic central heating and hot water (not air-to-air or air conditioning units)
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Who installs them: MCS-standard qualified heating engineers with system design and commissioning experience
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What's assessed first: Heat loss per room, existing emitter sizes, hot water cylinder requirements, electrical supply, and external siting options
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Grant available: The Boiler Upgrade Scheme currently offers £7,500 toward an eligible air-to-water heat pump installation (as of June 2026 — verify at gov.uk before relying on this figure)
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Coverage area: Portsmouth, Southampton, Fareham, Waterlooville, Havant, Chichester, and surrounding Hampshire and West Sussex areas
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Primary CTA: Request a property suitability survey — not a phone quote
20+
Years Combined Experience
100%
Gas Safe Registered Engineers
CP12
Certificates Issued
1 Hour
Most Domestic Inspections
Family
Run Business
Is an Air Source Heat Pump Right for Your Property?
Most people searching for heat pump installation in Portsmouth aren't after a basic explainer. They've done the reading. They want to know whether their specific home — their radiator sizes, their insulation, their hot water situation — is actually suited to making the switch. Here's where most Portsmouth households sit when they first get in touch:
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You're replacing a gas boiler that's reached the end of its life. The system is going regardless. The question becomes whether a like-for-like boiler swap makes sense, or whether this is the right moment to move to a heat pump — particularly with a £7,500 Boiler Upgrade Scheme grant potentially available.
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You've got an extension or renovation underway. New square footage means the old heating system won't cover the whole property. Rather than extending a gas setup that you might be replacing in five years anyway, some households use this moment to install an air-source heat pump designed around the whole revised floor plan.
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You're in a house with no gas connection. Oil, LPG, or electric storage heating properties often see the strongest financial case for heat pump adoption. The replace oil boiler with heat pump question comes up regularly in rural parts of the Chichester and Petersfield areas — and it's usually worth a proper assessment.
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You want lower running costs without having to manage a boiler contract. Heat pumps run differently from boilers — lower flow temperatures, longer heating cycles, weather-compensated controls — and the efficiency gains are real when the system is designed correctly. They're also significantly less dependent on fossil fuel price volatility.
If any of these scenarios match where you are, the most useful next step is a property suitability survey — not a ballpark quote over the phone.
What's Included
Why Most Heat Pump Problems Start Before Installation Day
There's a pattern in poorly performing air source heat pump systems. The heat pump itself — the outdoor unit, the refrigerant circuit, the controls — usually isn't the problem. The problem is what happened before it was ordered.
Under-sized emitters: A heat pump operates at a lower flow temperature than a gas boiler — typically 35–45°C versus a boiler running at 60–70°C or higher. To deliver the same amount of heat to a room at a lower flow temperature, radiators need to be larger. If the original radiator sizing was done for a high-temperature boiler system and nobody ran a room-by-room heat-loss calculation, those radiators won't cope. The result is a house that never quite gets warm — and a heat pump that gets blamed for it.
Incorrect heat pump sizing: Heat pump sizing isn't a matter of matching kilowatts to property square footage. It requires a proper heat-loss calculation based on insulation values, window sizes, ceiling heights, ventilation rates, and target indoor temperatures — carried out room by room. Oversized heat pumps have a short cycle (switching on and off too frequently), which destroys efficiency. Undersized systems simply can't meet peak demand in colder weather.
Hot water overlooked: An air-to-water heat pump takes over the domestic hot water function too — but a combi boiler has no storage cylinder. A heat pump system requires a dedicated hot water cylinder, typically an unvented cylinder if mains pressure is needed. If this isn't factored into the system design at the start, you end up retrofitting a cylinder into a space that wasn't planned for one.
Siting constraints not assessed: The outdoor heat pump unit needs adequate airflow clearance, minimal noise impact on neighbouring properties (which involves a sound assessment under Microgeneration Certification Scheme standards), and a surface that can bear the unit's weight. On Portsmouth's denser Victorian streets, that siting question isn't always straightforward — and it needs answering before any equipment is ordered.
Dv Plumbing and Gas Services starts every installation with a full room-by-room heat-loss survey, radiator sizing check, heat pump system design, and siting assessment. We don't quote on the phone and hope for the best. The survey is what makes the installation work.
What a Full Air Source Heat Pump Installation Covers
Heat-Loss Assessment & System Design: Before any equipment goes on order, we carry out a room-by-room heat-loss calculation based on your property's insulation, glazing, and floor area. This is what determines the correct heat pump sizing, radiator sizing (or confirms existing radiators will perform), and cylinder specification — not a rule-of-thumb estimate.
Air-to-Water Heat Pump Supply & Installation: The outdoor heat pump unit is positioned in line with MCS siting requirements, including sound assessment guidance and permitted development clearance distances. We handle all refrigerant circuit work, electrical supply connections, and weatherproofing of the external installation.
Hot Water Cylinder & System Integration: Most heat pump installations require an unvented cylinder or a purpose-designed thermal store for domestic hot water. We specify and install the cylinder as part of the same project — integrating it with the heat pump controls and heat pump commissioning sequence so the whole system is optimised from day one.
Controls, Commissioning & Handover: Weather compensation controls are set up and calibrated to your system's specific flow temperature curve. We commission the system to manufacturer standards, issue a commissioning certificate, and walk you through the controls before we leave — including how to read performance data and what to look out for in the first heating season.
The £7,500 Boiler Upgrade Scheme Grant — What You Need to Know
The Boiler Upgrade Scheme (BUS), administered by Ofgem, currently provides £7,500 toward the cost of an eligible air-to-water air source heat pump installation in England and Wales. Key points relevant to Portsmouth and Hampshire homeowners:
The grant is applied by your installer against the installation cost — you don't claim it separately
Your installer must hold current MCS (Microgeneration Certification Scheme) certification to apply for the grant on your behalf
Your property must have a valid Energy Performance Certificate (EPC) with no outstanding cavity wall or loft insulation recommendations (with some exceptions)
The grant applies to the heat pump installation, not to associated works like radiator upgrades or cylinder installation
Grant information last reviewed: 26 June 2026. Verify current eligibility at gov.uk/apply-boiler-upgrade-scheme before relying on these figures — scheme rules and amounts can change.
If you're interested in using the BUS grant, confirm that your chosen installer holds current MCS registration before proceeding. Ask for the MCS registration number and verify it at mcscertified.com.
Process
How We Install an Air Source Heat Pump in Portsmouth
01
Property Suitability Survey
One of our heating engineers visits the property to assess insulation levels, existing emitters, hot water provision, electrical supply capacity, available external siting positions, and any planning considerations under permitted development rules. You receive an honest assessment of whether a heat pump is the right solution — not a pitch.
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Room-by-Room Heat-Loss Calculation
We work through every heated room using BS EN 12831-compliant methodology — the same standard used by the MCS Heat Load Calculator. This produces the design heat load the system needs to meet, informs radiator sizing decisions, and determines the correct output capacity for the heat pump unit.
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System Design & Quote
We produce a written heat pump system design covering: heat pump model and output, emitter specifications (including any radiator upgrade needed), hot water cylinder type and volume, controls and zoning, and a breakdown of electrical supply requirements. The quote is fixed-scope based on this design — no mid-project surprises.
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Installation
Our engineers install the outdoor heat pump unit, run refrigerant pipework, connect the unvented cylinder or buffer vessel, upgrade or adjust emitters where the design requires it, and complete the electrical connections. We work cleanly and contain disruption to the areas directly affected.
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Commissioning & Handover
The system is commissioned to manufacturer standards, flow temperatures are set against weather compensation controls, and all performance parameters are recorded on the commissioning certificate. You leave the handover knowing how the system works, how to read the controls, and what to expect in the first heating season.
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Aftercare & Annual Servicing
A well-designed heat pump system needs an annual heat pump servicing visit to maintain efficiency and protect the manufacturer's warranty. We offer this as a standalone service — see our Air Source Heat Pump Servicing page for what's covered.
Air Source Heat Pump Installations Across Different Property Types
Victorian and Edwardian Terraces (Portsmouth, Southsea, Old Portsmouth): Period terraces present specific challenges — limited external siting space, older pipework, original single-skin walls, and radiators that were sized for high-temperature systems decades ago. The approach for these properties focuses on identifying the best external unit position (often a rear yard or side return), assessing each radiator individually, and in many cases recommending targeted upgrades rather than a wholesale radiator replacement. The phrase air source heat pump installation for Victorian terrace Portsmouth is one of the most specific searches we see — and it deserves a more specific answer than a generic heat pump brochure provides.
Bungalows (Waterlooville, Denmead, Cowplain, Havant): Single-storey homes with accessible roof space tend to suit heat pump installations well. The typically lower ceiling heights create good heat retention, pipework runs are simpler, and the ground-level footprint often provides more external siting options. Heat pump for bungalow Waterlooville is a long-tail search that reflects real enquiries — these properties often represent the most straightforward, highest-efficiency installations.
Homes Without a Gas Connection (Chichester, Petersfield, Emsworth, rural Hampshire): Off-gas properties — whether running on oil, LPG, or electric storage heaters — frequently see the strongest financial and operational case for switching to an air source heat pump. Oil and LPG price volatility is a recurring concern in rural Chichester and Petersfield households, and many of these properties have more external space for siting the unit. For those searching to replace an oil boiler with a heat pump in Chichester or similar, this is a transition we carry out regularly, and it starts with the same survey-first process.
Extensions, New Builds & Whole-System Renovations (Hampshire and West Sussex): A heating extension or renovation is the ideal moment to integrate a heat pump, because the system is being designed from scratch rather than retrofitted into a legacy layout. We work on extension projects across the South Coast where the new square footage is included in the heat-loss calculation from the start — avoiding the common problem of a heat pump that's correctly sized for the original house but undersized for the whole property.
Why DV Plumbing
Why Homeowners Across Portsmouth and Hampshire Choose Us
40+ Years of Combined Heating Experience: Dv Plumbing and Gas Services brings together engineers with decades of domestic and commercial heating background — not a training-scheme team learning on live jobs. That experience is what makes the difference between a correctly sized system and one that underperforms for its entire lifespan.
Survey Before System — Every Time: We don't issue heat pump quotes over the phone. Every installation begins with a property visit and a room-by-room heat-loss assessment. This isn't a selling tactic — it's the only way to design a system that actually works for your home.
Named Engineer Accountability: You deal with the same engineer from survey to handover. No hand-offs between a sales team and an installation crew. Named engineer accountability is something we build into every job — you know who is responsible for your system.
Fully Insured & Qualified: Every engineer working on your property is fully qualified and fully insured. All installations are carried out to the current Building Regulations and MCS installation standards.
Transparent, Scope-Fixed Quotes: Our quotes are based on a surveyed system design, not a square-footage estimate. The scope is agreed in writing before work starts. We won't discover additional costs mid-installation.
Aftercare Built In: We don't disappear after the commissioning visit. Annual heat pump servicing, warranty support, and advice on system performance are part of the relationship — not an add-on sold separately.
TESIMONIALS
What Our Customers Say
See how our expert servicing helps customers improve performance, extend system life, and enjoy complete peace of mind.
"Excellent service from start to finish. The engineer arrived on time, completed a thorough service, and explained everything clearly. Our heat pump is now running much more efficiently."
James Walker
"Professional, friendly, and knowledgeable. The annual service was completed quickly, and we now have peace of mind knowing our system is operating safely."
Sarah Collins
"I've used them for servicing multiple properties, and they've always been reliable. Great communication, fair pricing, and high-quality workmanship every time."
Michael Turner
"Very impressed with the attention to detail. They identified a small issue before it became a costly repair, and the whole process was hassle-free."
Emma Richardson
"Outstanding customer service and expert engineers. The servicing was thorough, and our air source heat pump is performing better than ever. Highly recommended."
David Brooks
"Fantastic service from a knowledgeable engineer. The heat pump was thoroughly inspected, cleaned, and tested, and everything was explained in a clear and friendly way. I’ll definitely book my annual service with them again."
Rachel Evans
TESIMONIALS
What Our Customers Say
See how our expert servicing helps customers improve performance, extend system life, and enjoy complete peace of mind.
"Excellent service from start to finish. The engineer arrived on time, completed a thorough service, and explained everything clearly. Our heat pump is now running much more efficiently."
James Walker
"Professional, friendly, and knowledgeable. The annual service was completed quickly, and we now have peace of mind knowing our system is operating safely."
Sarah Collins
"I've used them for servicing multiple properties, and they've always been reliable. Great communication, fair pricing, and high-quality workmanship every time."
Michael Turner
"Very impressed with the attention to detail. They identified a small issue before it became a costly repair, and the whole process was hassle-free."
Emma Richardson
"Outstanding customer service and expert engineers. The servicing was thorough, and our air source heat pump is performing better than ever. Highly recommended."
David Brooks
"Fantastic service from a knowledgeable engineer. The heat pump was thoroughly inspected, cleaned, and tested, and everything was explained in a clear and friendly way. I’ll definitely book my annual service with them again."
Rachel Evans
Air Source Heat Pump Installers Across Portsmouth, Hampshire & West Sussex
Our engineers are based locally and cover the South Coast regularly for air source heat pump installation surveys, installations, and servicing visits.
Primary Coverage (Portsmouth & surrounding): Portsmouth · Southampton · Fareham · Waterlooville · Havant · Chichester. These are our most active installation areas, where we carry out the majority of heat pump surveys and installations. If you're in any of these locations, we can typically offer a survey appointment within a short lead time.
Regular Coverage: Gosport · Whiteley · Petersfield · Emsworth · Hayling Island · Lee-on-the-Solent
Extended Coverage: Bosham · Cosham · Portchester · Southsea · Denmead · Cowplain · Clanfield · Old Portsmouth
Not sure if we cover your postcode? Get in touch, and we'll confirm
Related Services
Services That Work Alongside Your Heat Pump Installation
Heating Services
Underfloor Heating Installations
Air Source Heat Pump Servicing
Boiler Installations
Unvented Cylinder Installations
FAQ
Frequently Asked Questions — Air Source Heat Pump Installations in Portsmouth
Still have questions? Speak directly to one of our heating engineers.
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