Mixergy X Direct Slimline 475mm Unvented Cylinder | Electric Smart Cylinder 120-210L | 2.0 Controller

Description

The Mixergy X Direct Slimline is a stainless steel unvented cylinder for electric-only properties, built into a narrower 475mm case for cylinder cupboards and loft hatches where width is restricted. It shares the same 2.0 Controller, WiFi connectivity and smart tariff compatibility as the standard-case Mixergy X.

Spanning 120 to 210 litres across four SKUs, the slimline case is taller than the standard case at equivalent capacity, but uses identical stratified thermocline smart charging to heat only the water volume actually required.

120–210L

Capacity Range

475mm

Diameter

B

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.

Slimline 475mm Case

Purpose-built for restricted cylinder cupboards or loft hatches, trading additional height for a narrower footprint versus the 550mm standard case.

Stratified Smart Charging

Thermocline sensors mean the controller only heats the volume of water required, giving fast top-ups from as little as 32 minutes rather than a 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.

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 low across the range despite the taller, narrower profile.

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-475	120L	B	1247mm	143kg	1.25 kWh/24h	32 mins
MX-150-ELE-475	150L	B	1518mm	173kg	1.42 kWh/24h	32 mins
MX-180-ELE-475	180L	B	1790mm	208.4kg	1.51 kWh/24h	32 mins
MX-210-ELE-475	210L	B	1962mm	231.4kg	1.58 kWh/24h	32 mins

What is the difference between the slimline and standard case?

Both share the same controller, insulation and connections. The slimline case is 475mm diameter but taller at equivalent capacity, for restricted cupboard or loft hatch installations; the standard case is 550mm diameter.

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.

What does the weight full* figure account for?

Add 5kg to the full cylinder weight shown for cylinders fitted with an external heat exchanger.

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

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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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