A heat pump quote can look reassuringly simple: one figure for equipment, fitting and a warmer home. But the cheapest number is not always the lowest-cost choice. Knowing how to compare heat pump installers means looking beyond the headline price, so you can judge the design, workmanship, support and expected running costs behind it.
For homeowners and businesses across South Wales and the South West, this matters because every property is different. A well-designed air source heat pump can reduce reliance on fossil fuels and provide dependable heating. A rushed survey or poorly specified system can leave you paying more to run a home that still feels cold.
Start by comparing like for like
The first rule is simple: do not compare a detailed proposal with a one-line estimate. Ask each installer to survey the property and provide a written quotation based on the same broad requirements. If one company has allowed for new radiators, upgraded pipework and controls while another has not, their prices are not directly comparable.
A useful quote should name the proposed heat pump model and output, explain what is included in the installation, and separate any optional work. It should also make clear whether VAT, electrical work, scaffolding, condensate drainage, hot-water cylinder changes and making good are included. Vague phrases such as “subject to survey” are not automatically a warning sign, but they do deserve a clear explanation before you commit.
Be cautious if an installer recommends a heat pump size without carrying out a proper assessment. Bigger is not automatically better. An oversized unit may cycle on and off more often, while an undersized unit may struggle in colder weather. The right size comes from the heat your building loses, not from the size of your existing boiler.
Check MCS accreditation and the installer’s experience
For many customers, MCS accreditation is one of the clearest signs that an installer works to recognised standards. It is particularly relevant if you want to access eligible support schemes, including the Boiler Upgrade Scheme where available. Ask for the company’s MCS details and check that its certification covers heat pumps, rather than assuming an accreditation for solar panels applies to all technologies.
Accreditation should be the starting point, not the final decision. Ask how many heat pumps the company has installed, whether it regularly works on properties like yours, and who will carry out the work. A firm with experience of Victorian terraces, rural homes, newer estates or small commercial premises will better understand the practical issues those buildings can present.
You should also ask about manufacturer training and which brands the installer fits. A company that can explain why a particular unit suits your property is usually a better prospect than one that pushes the same model for every job. There is nothing wrong with specialising in one manufacturer, provided the recommendation is based on the survey and not simply on what is easiest to sell.
Look closely at the heat-loss calculation
The quality of the design has more influence on comfort than the badge on the front of the unit. Request a copy or clear explanation of the heat-loss calculation. This assesses how much heat each room needs on a cold day and informs the heat pump size, radiator selection and flow temperature.
Lower flow temperatures generally help a heat pump operate more efficiently. That may mean some radiators need to be larger, or that underfloor heating is especially useful in particular areas. It does not mean you must fully insulate a home before considering a heat pump, but practical improvements such as loft insulation, draught reduction and suitable windows can improve performance and may alter the recommended design.
Ask each installer to explain the assumed indoor temperatures, outdoor design temperature and proposed flow temperature in plain English. If one quote promises unusually low running costs, check what electricity tariff, household heat demand and hot-water use those figures assume. Estimates are helpful, but they are not guarantees. Your eventual bill will depend on the building, controls, weather and how you use the system.
Do not overlook hot water and controls
A heat pump project is not just an outdoor unit. The quote should cover how hot water will be produced, the size and location of any cylinder, and whether the existing system can be adapted. If space is tight, ask to see the proposed layout before accepting the quote.
Controls also deserve attention. Good controls make it easier to run a heat pump steadily and efficiently, but they should be understandable for everyone in the property. Ask the installer to describe how you will adjust temperatures, set schedules and deal with holidays or changes in routine. The best arrangement is not necessarily the most complicated one.
Compare scope, timing and disruption
Two installers may recommend similar equipment but offer very different levels of service. Read the scope of works line by line. One may include radiator upgrades, removal of the old boiler, system flushing, electrical upgrades and disposal of waste. Another may price these items separately, creating an unwelcome gap between the original quote and the final invoice.
It is sensible to ask who manages each stage of the project. Will the same company handle plumbing, electrics and commissioning? Are subcontractors used? What happens if unexpected pipework, asbestos or access issues are found? A professional installer will not pretend that every old property has no surprises, but they should explain how variations are agreed and priced.
Installation time matters too, particularly if your current heating is unreliable. Ask for an estimated start date, likely duration and whether there will be any period without heating or hot water. For commercial sites, discuss access, working hours and how disruption to staff or customers will be kept to a minimum.
Judge the total value, not only the upfront price
A lower quote can be good value when the scope, design and aftercare genuinely match the alternatives. It can also be low because essential work has been excluded or corners have been cut in the survey stage. Equally, the highest quote is not automatically the best. The goal is a system that is properly specified and supported at a fair, transparent price.
When reviewing costs, consider the expected running cost, warranty terms and likely maintenance needs alongside the installation price. Check the manufacturer warranty separately from the workmanship warranty. Ask what is required to keep each warranty valid, whether annual servicing is recommended, and whether the installer will help if a fault develops.
Payment schedules offer another useful clue. A reasonable deposit and staged payments linked to progress are easier to understand than a request for most of the money before work begins. Make sure you receive the documents needed for commissioning, registration and any applicable grant or guarantee process.
Ask for evidence of aftercare
Heat pumps work best when the homeowner understands how to live with them. Your installer should commission the system, show you how to use it and provide handover information. Ask whether a follow-up visit or performance check is included, especially after the system has been through a change in season.
Reviews can help, but read them with care. Look for comments about communication, tidiness, problem-solving and what happened after installation, not only star ratings. If possible, ask for examples of comparable completed projects. A reputable company should be comfortable discussing real-world outcomes while protecting previous customers’ privacy.
It is also worth asking who answers the phone if you need help. Local knowledge can be valuable when an installer understands the housing stock and can attend promptly across areas such as Cardiff, Newport, Swansea or Bristol. However, proximity alone is not enough: clear support arrangements and competent engineers matter more than a nearby postcode.
Use the same questions for every installer
To keep the decision fair, give each company the same opportunity to explain its proposal. Ask about accreditation, heat-loss calculations, heat pump size, radiator changes, total inclusions, warranties, timescales, payment stages and aftercare. Keep the quotes and answers together in one simple comparison sheet.
You do not need to become a heating engineer to make a sound decision. You need enough information to see whether each installer has understood your property and has priced the work honestly. If an answer feels unclear, ask again. A good installer will welcome sensible questions rather than pressure you to sign quickly.
Solar Planet can help simplify the process by connecting you with up to four trusted, MCS-accredited local installers, giving you a clearer basis for comparison without the task of approaching each company separately. Take your time with the proposals, choose the team that gives you confidence, and make sure the system is designed for the way your property is actually used.
