The Mixergy X Direct Standard is a stainless steel unvented cylinder for electric-only properties, heated via immersion and controlled by the 2.0 Controller. Every unit ships with WiFi connectivity, a digital gauge, and full compatibility with smart tariffs such as Octopus Agile and Octopus Go.
The 550mm standard case spans 120 to 300 litres across six SKUs, using stratified thermocline sensing so the controller only heats the water volume actually needed, rather than reheating the full tank on every cycle.
Please Note: Current Lead Times
Mixergy cylinders typically ship on a 3 to 6 week lead time, depending on model and quantity ordered. Please call us to check current availability before confirming an installation date.
Good to Know: Smart Tariff Compatible
The Mixergy app supports automatic scheduling against Octopus Agile, Octopus Go, EDF GoElectric Overnight, E.ON Next Drive and British Gas Heat Power tariffs.
Important: Unvented Installation Requirement
This is an unvented cylinder. Installation must be carried out by a G3-competent operative and commissioned per the manufacturer's Installation & Servicing instructions. Incoming mains pressure must be less than 10 bar and at least 1 bar, with a minimum flow rate of 10 L/min. Unvented cylinders must never be used with a solid fuel heat source.
Stratified Smart Charging
Thermocline sensors mean the controller only heats the volume of water required, giving fast top-ups from as little as 44 minutes rather than a slow full reheat.
Electric-Only Design
Purpose-built for properties without a gas or oil boiler, using the 3kW immersion heater as the sole heat source, ideal for off-peak and time-of-use tariffs.
550mm Standard Case
The full-diameter case gives maximum capacity per unit height, suiting cylinder cupboards without width restrictions.
Full App Control & Monitoring
The bundled WiFi dongle connects to the Mixergy app for remote boost, live charge-state monitoring, and voice control via Google Assistant or Amazon Alexa.
Low Standing Heat Loss
50mm CFC/HCFC-free polyurethane foam insulation keeps standing heat loss as low as 0.86 kWh/24h on the 120L model.
Safety-Certified Components
Factory-fitted monobloc cold water inlet control group, T&P relief valve (7 bar/90°C), and expansion vessel charged to 3 bar.
Controller & Electrical
| Controller generation |
2.0 Controller |
| Immersion heater rating |
3kW, 230–240V~ |
| Immersion heater specification |
EN 60335-2-73, 356mm Incoloy |
| Electrical supply |
16A, dedicated MCB-protected circuit |
| Thermostat safety cut-out |
80°C |
| Adjustable temperature range (digital) |
50–65°C |
| Connectivity |
WiFi dongle (supplied) or hardwired Ethernet |
Unvented Safety Components
| Max. supply pressure to PRV |
10 bar |
| Operating pressure |
3 bar |
| Expansion vessel charge pressure |
3 bar |
| Expansion relief valve setting |
6 bar |
| T&P relief valve setting (pressure) |
7 bar |
| T&P relief valve setting (temperature) |
90°C |
Construction
| Cylinder material |
Stainless steel |
| Insulation type |
CFC/HCFC-free polyurethane foam |
| Insulation thickness |
50mm |
| Connection size/type |
22mm compression |
Model Range
| Model Code |
Capacity |
ErP |
Height |
Weight Full |
Std. Heat Loss |
Min Reheat |
| MX-120-ELE-550 |
120L |
B |
930mm |
140.7kg |
0.86 kWh/24h |
44 mins |
| MX-150-ELE-550 |
150L |
B |
1117mm |
173.2kg |
0.91 kWh/24h |
44 mins |
| MX-180-ELE-550 |
180L |
B |
1305mm |
205.2kg |
0.96 kWh/24h |
44 mins |
| MX-210-ELE-550 |
210L |
B |
1493mm |
239.4kg |
1.01 kWh/24h |
44 mins |
| MX-250-ELE-550 |
250L |
C |
1743mm |
280.2kg |
1.34 kWh/24h |
44 mins |
| MX-300-ELE-550 |
300L |
C |
1989mm |
326kg |
1.68 kWh/24h |
44 mins |
What is the difference between Direct and Indirect models?
Direct models heat water using the immersion heater only, suited to electric-only properties. Indirect models add a primary coil for a gas, oil or LPG boiler.
Does the Mixergy X need an internet connection to work?
No — the cylinder heats and operates normally without WiFi. An internet connection unlocks the app features: remote control, smart tariff scheduling, and usage monitoring.
Can the Mixergy X Direct be used with a heat pump?
Yes. The controller supports a heat pump heat source setting, and cylinders have dedicated heat pump-ready ports (capped off if unused). An optional plate heat exchanger is available.
What certification does the installer need?
Installation must be carried out by a competent operative who has completed a recognised unvented hot water systems course, with commissioning recorded per Building Regulations (G3) requirements.
What is included in the box?
Each cylinder ships with the monobloc cold water inlet control group, expansion vessel with mounting bracket, factory-fitted immersion heater(s), WiFi dongle, Ethernet cable, gauge, and user guide.
How long is the lead time and how do I check stock?
Lead times typically run 3 to 6 weeks depending on model and order quantity. Please call us to confirm current stock and expected delivery before booking an installation.
