How Mixergy saves your customers money and energy

January 24, 2025

As an installer, you know the benefits of fitting a Mixergy cylinder into your clients’ hot water systems. But how can you explain these advantages in a way that resonates with them? Whether they want to be energy efficient, save money or start their journey to a smart and sustainable home, here are some key points and figures to help.

Reduce energy: How machine learning get the best out of Mixergy’s features

A 2018 field trial funded by the Department for Business, Energy & Industrial Strategy (BEIS) and Innovate UK found that a Mixergy X cylinder could save your clients up to 40% on their hot water bills. The trial showed that using machine learning to heat water during off-peak times, when electricity is cheaper, led to significant savings. The Mixergy cylinder reduced energy use by 12% by only heating the water needed. This cut the yearly operating cost from £135.05 to £80.30—a saving of £54.75.

Save money: Integrating with a smart tariff can save up to 60%

In 2024, Mixergy homeowner shared his data with us showed us from Jul 2023-Aug 2024. This showed that when he paired his Mixergy X with the Agile Octopus smart energy tariff, he saved an average of 60% on energy costs each month. Agile Octopus offers lower electricity prices during off-peak or low-demand times, which works well for clients using smart home technologies like solar panels and batteries.

Mixergy saves money. A Mixergy homeowner saw an average saving of 60% when integrating their Mixergy X with the Agile Octopus smart tariff.
This line graph shows the Actual Cost per KwH vs Energy Cap cost per KwH (£) from July 2023 to August 2024.
An average saving of 60.34% between July 2023 and August 2024 was achieved when integrating with the Agile Octopus tariff. This was provided by a homeowner with a detached 1930s home; three bedrooms; one bathroom; retrofitted with insulation, MVHR and a Mixergy X 180L cylinder.

So, what makes the Mixergy X cylinder so efficient? Unlike traditional cylinders, which heat water from the bottom up, Mixergy cylinders use thermal stratification, when connected with direct electric, solar PV and / gas boilers. This heats a small amount of water at the top first and expands the heated volume downward, making hot water storage more efficient. By heating only what’s needed, heat loss is reduced, and hot water is delivered faster.

What about when Mixergy works with a heat pump?

With a heat pump, we don’t heat using thermal stratification to optimise the heat pumps low energy flow. But we can improve the performance of a heat pump system by up to 24%. This is how we do it…

Traditional heat pump systems use a coil inside the hot water cylinder to transfer heat, but this can be less efficient as the system heats water that’s already partially warm. Mixergy takes a smarter approach by using a plate heat exchanger and a control interface.

This system transfers energy from the coldest part of the cylinder, ensuring better efficiency and avoiding problems like coil lockout. Plus, Mixergy cylinders are easy to retrofit, future-proof, and work with multiple energy sources, making it simple for households to switch to renewable energy solutions like heat pumps whenever they’re ready.

For more information on this works, see How Mixergy cylinders work with a heat pump.

Getting the most out of Mixergy with the App

For the best results, the Mixergy cylinder should be connected to the internet, with the companion app downloaded. The app lets clients check the amount of hot water available, its temperature, cost, and remaining space. It also allows them to set schedules, adjust temperatures, and enable holiday mode.

In short, the Mixergy X cylinder offers both significant energy and cost savings, making it a solution your clients will appreciate. Whether their priority is reducing energy use, saving money or both, the Mixergy cylinders offer a solution for now and the future. Once they understand the benefits, they’ll thank you for recommending such a cost-effective and efficient system.


Save £100 on your purchase

When you buy a Mixergy X or Solar X smart hot water cylinder, we’ll take £100 off your total shop. Offer available until midnight on 13 February.