Mixergy announced the Mixergy Cube X on 22 November 2023, describing it as a smart, energy-saving cylinder for heating and hot water aimed at homes where space is limited1. The company gave no price, no launch date beyond "Coming soon…", and no technical specification such as cylinder volume or output1.
The unit uses what Mixergy calls patented volumetric heating technology and can supply hot water on its own or space heating and hot water together1. Mixergy states it is "perfect for smaller apartments and properties designed with fabric-first principles", and that it can be built into utility frame solutions alongside other appliances to save further space1. A modular lid is intended to allow hot water first and space heating later1.
On energy sources, Mixergy says the cylinder can work with a Mixergy Solar Diverter so that surplus electricity from a solar PV system, which would otherwise be exported to the grid, is stored and used for hot water or heating1. It can also connect to heat pumps to provide both space heating and hot water, which Mixergy says removes the need for two cylinders1. The company states the smart controls use machine learning to anticipate a home's needs, and that smart tariff integration is included1.
Mixergy also states the Cube X is easier to install because no G3 unvented certification is required1. No independent confirmation of that claim, and no detail of how the unit is classified or approved under building regulations in the UK, has been reported1.
"The new Mixergy Cube X is the smart, energy-saving, discreetly sized way to provide heating and hot water, especially when space is at a premium."
| Feature | As stated by Mixergy |
|---|---|
| Outputs | Hot water only, or space heating and hot water1 |
| Heating method | Patented volumetric heating technology1 |
| Solar | Mixergy Solar Diverter stores surplus PV output for hot water or heating1 |
| Heat pumps | Connects to heat pumps for space heating and hot water, removing the need for two cylinders1 |
| Controls | Machine learning, smart tariff integration1 |
| Installation | No G3 unvented certification required1 |
| Availability | "Coming soon…"1 |
Why it matters for households
A cylinder that covers both hot water and space heating changes what a home needs to fit. Where a heat pump installation would otherwise require a separate cylinder and a separate emitter circuit, Mixergy claims one unit can do both, which matters most in flats and smaller houses where plant space is the binding constraint1. The modular lid is presented as a way to start with hot water and add space heating later, so a household is not committing to the full system at once1.
Storing surplus solar generation in a cylinder rather than exporting it is a route to using more of a home's own generation on site, and smart tariff integration points to shifting when the cylinder heats to cheaper periods1. Both depend on the household having solar PV or a time-of-use tariff in the first place.
The claim that no G3 unvented certification is needed is the one with the clearest practical effect, because it bears on who can install the unit and what paperwork is involved. Mixergy has not explained the basis for it, and no independent detail has been reported1.
What happens next
Mixergy has said only that the Cube X is "Coming soon…"1. No launch date, price, size range, efficiency figures or installer arrangements have been reported1.
Sources1 cited
- Introducing the Mixergy Cube X - Mixergy, mixergy.co.uk