Mixergy X Direct Standard 550mm Unvented Cylinder | Electric Smart Cylinder 120-300L | 2.0 Controller

Description

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.

120–300L

Capacity Range

550mm

Diameter

B/C

ErP Rating

50mm

PU Foam Insulation

3kW

Immersion Rating

WiFi

App Connected

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.

BTU Calculator

BTU & WATT Calculator

Room Dimensions

Length (in m):

Width (in m):

Height (in m):

Room Type

Living Room

Bedroom

Kitchen

Bathroom

Conservatory

Hallway

Glazing Type

Single Glazed

Double Glazed

Triple Glazed

External Walls

0 Wall

1 Wall

2 Walls

3 Walls

4 Walls

Insulation Level

Poor

Average

Good (New Build)

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