Heat Pumps in Scotland: The Bit Nobody’s Joining Up

Think about this common scenario:

Solar panels installed by one company

A battery installed by another

A Vaillant aroTHERM heat pump installed by a plumber

Not one of them checked what the other had done.

The result? Heat pumps pulling electricity from the grid at 27p per kWh while a fully charged GivEnergy battery sits idle in the garage. The battery not being configured to supply the heating system. The house running like this and no one has noticed.

And we see this all the time across Central Scotland.

Different trades installing good equipment, but nobody joining the system together.

That’s why we brought dedicated heat pump specialists in house to join our solar and battery teams. We were sick of turning up to fix solar systems and finding heating setups completely isolated from the rest of the house.

At a Glance

The Biggest Energy Bill in Your House

People worry about small things like phone chargers and lights. A phone charger uses about 5 s.

Meanwhile, your space heating and hot water have been burning through energy, usually accounting for around 60% of a home's energy bill.

With gas heating, you have almost no control. If gas prices go up, you pay it. You can't generate gas on your roof. You can't store it in a battery. You can't buy it cheaply at 2am.

Electricity is different. When heating runs on electricity, suddenly you have options.

You can:

• generate power with solar panels
• store it in a home battery
• buy cheap overnight tariffs like Octopus Intelligent Go
• automate when your heating runs

That’s the real reason heat pumps are becoming popular. Not because they're trendy. Because they turn heating into a system you can optimise.

Why Heat Pumps Are So Efficient

A typical gas boiler produces roughly 90–92% efficiency. Meaning you get about 92p worth of heat from every £1 of gas.

A well-designed heat pump works differently. It moves heat rather than creating it. For every 1 unit of electricity, it can deliver around 3 unitseat. That’s called a Coefficient of Performance (COP) of around 3.

So instead of burning fuel, the heat pump is harvesting heat from the air outside. That’s why electricity based heating can still be cheaper, even when electricity costs more per unit than gas.

“But Heat Pumps Don’t Work in the Cold”

You may think so in Scotland. But the idea doesn’t hold up.

Countries like Norway, Sweden and Finland have some of the highest heat pump adoption rates in the world, and their winters are far colder than ours.

The real issue isn’t the technology. It’s poor installation.

Gas boilers heat radiators to around 60–65°C. Heat pumps work best around 35–45°C.

If your radiators were designed for higher temperatures, some rooms may struggle to heat properly at lower flow temperatures.

That’s why proper installations require:

• Room-by-room heat loss calculations (MIS 3005 standard)
• Correct radiator sizing
• Weather compensation controls
• Proper commissioning

Skip those steps and the system ay an installer sets the heat pump flow temperature to 55°C. That’s extremely inefficient. If the flow temperature is lowered to 40°C and radiators are upgraded, electricity usage will drop.

Don’t be that homeowner paying higher bills simply because the system isn’t configured properly.

When Solar, Battery and Heat Pumps Work Together

This is where things start to make real sense.

When you combine:

• Solar panels
• Battery storage
• Heat pumps

You create a complete energy system.

On a sunny day in spring, a typical solar array might generate 20 kWh of electricity. A home may only use around 8 kWh during the day. The battery fills. Hot water heats through a solar diverter. And excess power can run the heat pump.

That’s effectively free heating.

Winter works differently. Solar production drops, but batteries still help.

For example: A 9.5kWh battery on an overnight tariff charging at 7p/kWh (at the time of writing) can store cheap electricity overnight and power the heat pump the next morning. winter, that can save hundreds of pounds. But again, this only works if everything is configured properly.

Heat Pump Grants in Scotland

Right now, Home Energy Scotland offers significant support for heat pump installations.

Homeowners can receive:

• £7,500 grant toward installation
• Up to £7,500 interest-free loan
• Rural homes may qualify for £9,000 grants

The system must:

• Provide both heating and hot water
• Meet EPC requirements
• Be installed by an MCS-certified installer

Important note: This grant only applies to heat pumps. Solar panels and battery storage are not included in this funding scheme, even though they can dramatically reduce running costs.

Will a Heat Pump Actually Save Money?

Sometimes. And anyone who promises guaranteed savings without seeing your house is guessing.

Running costs depend on things like:

• insulation levels
• radiator sizing
• system design
• electricity tariff
• solar generation
• battery storage

When everything is designed correctly, heat pumps can run cheaper than g When they're installed poorly, they can cost more.

The technology isn't the deciding factor. The design and installation are.

Why System Design Matters

Most houses have multiple contractors involved. Solar installers. Plumbers. Electricians.

Each does their own piece of the job. But no one checks how everything interacts.

Bad situations can be:

• Consumer units don’t have enough capacity
• Solar diverters aren't configured with heating controls
• EV chargers trip circuits when the heat pump starts
• Batteries aren't connected to heating loads

The equipment is good. But the system isn’t designed as a system.

That’s why when solar, batteries, heat pumps and EV chargers are installed, they should be installed together, start with one full system design.

One survey. One set of calculations. One commissioning process. Everything works together.

Thinking About a Heat Pump?

We install MCS-certified heat pump systems across Central Scotland, including:

• Stirling
• Falkirk
• Livingston
• Edinburgh
• Perth

're considering a heat pump or want to understand how it could work with solar panels and battery storage, give us a call.

And if a heat pump isn't right for your property, we'll tell you that too.

TL;DR

Most heat pump problems in Scotland aren’t caused by the technology. They happen because:

• systems aren’t designed properly
• solar, battery and heating aren't connected together
• installers don't configure controls correctly

When the whole system is designed properly, heat pumps can be one of the most efficient ways to heat a home.

Frequently Asked Questions