The Mixergy 120 Litre R290 iHP Integrated Heat Pump Cylinder is a compact, smart unvented hot water cylinder with an integrated R290 refrigerant heat pump, delivering highly efficient, low‑carbon hot water for all‑electric homes and apartments.

Product Description

The Mixergy iHP X 120L unit combines a Duplex stainless steel cylinder with a top‑mounted, modular air‑to‑water heat pump head. Using patented top‑down stratified heating, it delivers usable hot water in under 30 minutes while using around three times less electricity than a standard direct electric cylinder. The system connects to the Mixergy app for machine‑learning schedules, tariff integration and live hot water level indication.

Key Features

• Integrated R290 heat pump: Air‑to‑water heat pump built into the cylinder head, no external heat pump unit required.
• 3x more efficient: Coefficient of performance (CoP) around 3.4, significantly reducing running costs vs direct electric cylinders.
• Rapid hot water: Top‑down heating provides usable hot water in under 30 minutes, up to 10x faster than conventional integrated heat pump cylinders.
• Smart control: Mixergy app with machine learning, smart scheduling, usage insights and support for time‑of‑use tariffs.
• Built to last: 25‑year cylinder warranty and 5‑year heat pump head warranty (typical Mixergy terms).
• Compact and modular: Cylinder and head supplied as two pieces for easier handling and installation, suitable for retrofits and new builds.

Technical Specifications

• Model: MX-120-IH2-579 – 120L Integrated HP R290 Smart Cylinder.
• Nominal capacity: 120 litres.
• Cylinder material: Duplex stainless steel.
• Refrigerant: R290 (propane), typical factory charge around 150 g.
• Heat pump rating: Approx. 0.55 kW electrical input, 1.5 kW max heat output.
• CoP: Approximately 3.4 under stated test conditions.
• Achievable hot water temperature (HP only): Up to 59°C.
• Back‑up immersion heater: 2 kW, 1¾" BSP (fitted).
• Electrical supply: 13 A, 230–240 V~.
• Standing heat loss: Approx. 0.54–1.06 kWh/24 h.
• ErP rating: A+ for the iHP X R290 range.

Dimensions & Weights

• Height: 1325 mm.
• Diameter: 580 mm.
• Weight (empty): 83 kg.
• Weight (full): 203 kg.
• Water connections: 22 mm compression.
• Air duct connection: 150 mm diameter, airflow approx. 500 m³/h (for intake/exhaust ducting through an external wall).
• Sound power level: Around 50 dB at the unit.

Included Components

• Unvented kit: pressure reducing valve, check valve, pressure & temperature relief valve, expansion relief valve, tundish and expansion vessel (with bracket and 3/4" × 22 mm adaptors).
• 2 kW immersion heater (fitted).
• Integrated R290 heat pump head unit.
• Powerline‑to‑Ethernet adapter and Ethernet cable.
• Control gauge and onboard electronics.
• User guide and iHP X installation/servicing instructions.

Applications & Notes

• Ideal for small to medium all‑electric homes, flats and apartments where external heat pumps are impractical.
• Suitable for retrofit or new build, installing much like a standard unvented cylinder, with added requirement for external wall ducting.
• Supports smart tariffs and carbon‑conscious operation via the Mixergy app’s scheduling and optimisation features.
• Must be installed and commissioned by a G3‑qualified installer following Mixergy’s iHP X installation manual and local regulations.