Why Are Some Heat Pumps Costing a Fortune to Run?
Most of the time, the high energy bills come down to issues with installation rather than the heat pump itself. We don’t believe this is entirely the installer’s fault—there’s a bigger problem within the industry. Heat pumps are still relatively new in the UK market. As we move away from gas boilers, there’s a lack of proper training and experienced engineers to handle these low-temperature systems correctly.
What’s Going Wrong with Heat Pumps?
There are a few common issues with heat pump installations that can cause inefficiencies:
- Incorrect Weather Compensation Settings: Weather compensation settings adjust your heating based on the outdoor temperature, which should make the system more efficient. However, if these settings are too high, your heat pump ends up working harder than it needs to, wasting energy.
- Third-Party Controls: Some systems are controlled by third-party thermostats that turn the heat pump on and off. This can cause the system to “cycle,” which reduces efficiency and drives up your energy bills.
- Undersized Pipework: If the pipes used in your system are too small, the heat pump struggles to circulate heat properly, making it harder to keep your home warm.
These problems are preventable with proper design, setup, and commissioning. This is why industry-specific training is so important.
The Importance of Proper Training
To install heat pumps correctly, engineers need specialised training in system design, especially for low-temperature heating. Our lead engineers at Custom Renewables have had the privilege of learning from industry leaders like Heat Geek and Northampton Academy. These training companies focus on how to design systems that run at lower temperatures and optimise flow rates for efficient heat transfer.
We are proud to be Heat Geek Elite registered installers, as well as winning the Heating Installer of the year award.
Without this kind of training, it’s easy to make mistakes that lead to a heat pump performing below its potential—often with a Coefficient of Performance (COP) lower than 2. This means the system is using a lot more electricity than necessary to generate heat. This can be costly for homeowners.
What Can You Do?
If your heat pump isn’t performing as expected, there are steps you can take:
- Have Your System Checked: Get an experienced engineer to review your installation. They can optimise your settings, especially the weather compensation. This ensures everything is running as efficiently as possible.
- Understand Your Controls: Make sure you’re using the right control strategy. Avoid third-party thermostats that switch the system on and off frequently. Your heat pump should be running steadily, not cycling on and off.
- Proper System Design: If you’re considering a heat pump or upgrading your system, ensure the installer is well-trained and follows best practices for low-temperature heating systems.
In the end, a well-installed heat pump should not cost you a fortune. It should save you money on your energy bills. But getting it right from the start with the right setup and knowledge is key to making the most of your investment.
If you would like some technical help or a quotation for a heat pump in your home, contact us today!

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