Homeowner Guide Choosing the right cylinder for you

The iHP X is our all-in-one heat pump cylinder, with a built-in heat pump sitting right on top, dedicated to heating your home’s hot water efficiently.

If you’re using an external energy source—like a heat pump, gas boiler, or solar PV—then Mixergy X or Solar X might be the better fit.

Not sure which one’s right for you? Your installer will know exactly what works best for your setup.

Hot water savings depend on your home and household size, but whatever your setup, Mixergy cylinders are designed to help you save as much as possible. With built-in machine learning and smart tariff integration, you get maximum efficiency and lower energy bills.

Here’s how much you could save*:

• Up to 60% savings with smart tariff integration and solar PV
• Up to 21% reduction in gas consumption if you’re using a gas boiler
• Up to 40% lower bills just by switching to our machine learning and auto schedules
• £40 annual rebate when you opt into the British Gas Mixergy Extra energy offer—just for turning your cylinder on!

*Savings are based on real-world customer data. Mixergy cylinders provide unparalleled access to your energy use. Our figures are compared to the average household energy consumption and energy price cap at the time of recording. Read more about how Mixergy saves money. 

You’ve have two options: connect directly to your solar panels with our Solar X or go through a third-party diverter, by adding a PV Switch to a Mixergy X.

Going direct means you can store the extra solar energy that would normally go back to the grid and use it for your hot water instead—maximising what you generate.

Prefer a diverter? No problem. Mixergy works seamlessly with top brands like MyEnergi Eddi and Solar iBoost, so you can manage your solar energy however works best for you.

Our Mixergy X and Solar X cylinders are built to be heat pump-ready.

If you’re planning to install a heat pump, let your installer know when purchasing your cylinder. They’ll ensure your setup is designed correctly.

Mixergy cylinders are currently the only cylinders on the market which can be ‘Grid-enabled’ for use with smart energy tariffs from your utility company.

To install a Mixergy cylinder, you’ll need a fully qualified and competent plumber or heating installer with experience in unvented systems.

• In England & Wales, your installer must hold a G3 qualification
• In Scotland, they need a P3 qualification
• In Northern Ireland, a P5 qualification is required

Qualified installers can provide a registration card as proof of their credentials.

If you’re looking for an installer, we recommend choosing a Mixergy Expert. While Mixergy Experts aren’t employed or contracted by us, they receive specialist training on our products, and we verify their certifications and insurance. Please note that Mixergy cannot take responsibility for work carried out by any installer.

Mixergy cylinders provide up to a third more usable hot water than traditional cylinders, meaning you might not need as large a tank as you think. Ask your installer if a smaller size could work for your home—you could save space without sacrificing performance.

Our cylinders range in diameter, starting at 495mm to 582mm, and will have additional clearance requirements.

Mixergy cylinders are built to stay connected—linking to our app, syncing with smart tariffs, and giving you full remote control. Heading off on holiday? Just switch to Holiday Mode and save energy while you’re away.

If your internet ever drops, we’ve got a handy wired gauge on the cylinder, so you can still get hot water fast.

For the best connection, we recommend hardwiring your cylinder to your router, so be sure to mention this to your installer.

The length of warranty depends on the type of product you have.

• Mixergy X & Mixergy Solar X cylinders – 25 years on the cylinder and 3 years on the components.
• Mixergy iHP cylinders – 25 years on the cylinder, 5 years on the head unit and 3 years on the components.

For more information, see the Warranty Terms & Conditions.

Beyond our standard warranty, we offer Mixergy Care and Mixergy Care Plus plans for added peace of mind. Once your cylinder is registered, you can easily purchase these plans through the Mixergy App. To learn more about coverage and benefits, visit the Warranty & Care Plans page on our website.