Why Is My Heat Pump Using So Much Electricity?

Why Is My Heat Pump Using So Much Electricity?

Many homeowners are surprised by how much electricity their heat pump uses — especially during winter.

While heat pumps are designed to be efficient, higher-than-expected running costs are one of the most common concerns we hear.

👉 In many cases, the issue isn’t the heat pump itself — but how the system has been designed, configured, or is operating.

⚡ What Is “Normal” Electricity Usage?

Heat pump running costs vary depending on:

• Property size and insulation

• Outdoor temperature

• Flow temperature settings

• System design and installation quality

During colder weather, electricity usage will naturally increase as the system works harder.

👉 However, if costs seem consistently higher than expected, it’s worth investigating further.

⚠️ Common Reasons for High Electricity Usage

1. Flow Temperature Is Too High

One of the biggest drivers of running costs is flow temperature.

The higher the flow temperature, the harder the heat pump has to work — reducing efficiency and increasing electricity consumption.

2. The System Runs Constantly

Heat pumps are designed to run for long periods, but they should still maintain temperature efficiently.

If your system runs continuously and still struggles to heat your home, it may be working inefficiently.

3. Poor Heat Distribution

If heat isn’t being distributed properly around the system, the heat pump may run longer than necessary.

This can be caused by:

• Poor circulation

• Incorrect balancing

• Pipework restrictions

4. Incorrect System Design or Sizing

If the heat pump is undersized or the system design is incorrect, it may struggle to meet demand — leading to longer run times and higher electricity usage.

This is also one of the most common findings in our performance reviews, and it is explored in detail in our guide on why heat pump radiators only feel lukewarm. Understanding the Delta T relationship is key to knowing whether an upgrade is necessary or whether the existing radiators can work with a correctly configured flow temperature.

5. Weather Compensation Not Set Correctly

If weather compensation is not configured properly, the system may run at unnecessarily high temperatures.

6. Backup Heater Running Frequently

If your system uses an electric immersion or backup heater regularly, this can significantly increase electricity usage.

Frequent use outside of very cold conditions is usually a sign of a system issue.

🧠 Why This Happens

In many systems we review, high electricity usage is not caused by a single issue — but a combination of:

• Flow temperature set too high

• Poor system balance

• Incorrect setup or commissioning

• Mismatch between system size and property heat loss

👉 In other words: small inefficiencies add up.

🔍 What Should a Well-Performing System Do?

A properly designed and configured heat pump should:

• Run steadily without excessive cycling

• Maintain indoor temperatures efficiently

• Operate at sensible flow temperatures

• Avoid frequent use of backup heaters

👉 High electricity usage is often a symptom that something isn’t quite right.

One area that often goes unexamined when running costs are high is whether the system was handed over with the correct settings in the first place. Installers sometimes leave systems configured for a smooth handover visit rather than long-term efficiency, and homeowners have no baseline to compare against. If you are an installer working with a customer whose electricity bills are higher than they should be and you want independent input on whether the configuration is the cause, our Partner Installer Support service provides exactly that kind of structured third-party technical review.

💰 Need Help Reducing Your Running Costs?

If your heat pump is using more electricity than expected, it’s usually a sign that something within the system design, setup, or configuration needs attention.

👉 If you already have a system installed, you can request a full heat pump performance review, where we assess flow temperatures, system performance, and overall setup to identify exactly what’s driving your running costs.

👉 If you’re planning an installation or reviewing a quote, you can request a pre-installation design & heat loss review to ensure the system is designed correctly from the start — helping avoid high running costs later on.

Both services provide clear, independent technical advice — no sales, no installation upsell.