Switching to an air source heat pump is a big (and brilliant) step towards a greener, more efficient home. But one of the most common questions we get from homeowners across Edinburgh the Lothians Fie and the Scottish Borders is:
“Will I need to replace all my radiators if I install a heat pump?”
The short answer? Sometimes — but not always.
Let’s break down why radiator upgrades matter, how to tell if yours are suitable, and what to expect during the process.
🌡 Why Radiators Matter for Heat Pumps
Air source heat pumps operate differently from traditional boilers.
- A gas boiler often heats your radiator water to around 70°C or higher
- A heat pump typically heats radiator water to around 35–55°C
This lower temperature means your radiators need to be more efficient at distributing warmth — often by being larger or newer than those that you have.
🔎 Will My Existing Radiators Work?
Whether or not you need new radiators depends on:
1. The Age and Size of Your Current Radiators
- Old, single-panel radiators may not give off enough heat.
- Modern, double-panel or convector radiators often work just fine.
2. Your Home’s Insulation
- Well-insulated homes hold heat better — so smaller radiators can sometimes still do the job.
- If your insulation is poor, you may either need larger radiators or improve the insulation first.
3. Room-by-Room Heat Loss
We’ll carry out a heat loss survey to determine how much warmth each room needs. This tells us:
- Which radiators need upgrading
- Whether any can stay exactly as they are
- You might be considering underfloor heating instead in some rooms
🛠 What Happens If I Need New Radiators?
If radiator upgrades are needed, don’t panic — we handle this as part of your installation plan. It typically involves:
- Removing old radiators and safely disposing of them – we are SEPA registered
- Installing new radiators that are properly sized for heat pump use
- Rebalancing the heating system so each room warms up evenly
We’ll keep disruption to a minimum and leave your home tidy and warm.
💷 Will This Add to the Cost?
Yes, new radiators do add to the overall cost, but:
- We always quote for this upfront after your home survey
- Not every radiator in your home may need replacing — just the ones that aren’t up to the job
🧮 Heat Pumps + Radiators = Efficient Combo
When properly sized, radiators work beautifully with heat pumps.
You’ll enjoy:
- Comfortable, consistent warmth throughout the day
- Lower running costs compared to oil or electric
- A quieter, smarter heating system
And best of all — no chilly surprises in the depths of a Scottish winter.
🏠 What About Underfloor Heating?
Underfloor heating is a great partner to heat pumps, but it’s not essential.
We often install systems that use a mix of radiators and underfloor heating — for example:
- Radiators in bedrooms
- Underfloor heating in living areas or bathrooms
We’ll advise on what makes sense for your home, layout, and budget.
🧰 How Latent Heat Edinburgh Can Help
We’re not just heat pump installers — we’re home heating specialists. At Latent Heat, we:
- Carry out detailed room-by-room heat loss surveys
- Give honest advice on which radiators (if any) need upgrading
- Include all costs and options clearly in your quote
- Guide you through funding options to reduce your upfront costs
📍 Let’s Find Out What Your Home Needs
Based in Edinburgh Fie .Scottish Borders or the Lothians?
Book your free home survey with Latent Heat Edinburgh and we’ll help you:
✅ Assess radiator suitability
✅ Maximise energy efficiency
✅ Qualify for Scottish heat pump funding
✅ Stay warm and comfortable — whatever the weather