Mixergy 250L R290 iHP Integrated Heat Pump Cylinder

The Mixergy 250 Litre R290 iHP Integrated Heat Pump Cylinder is a large-capacity, smart unvented hot water cylinder with an integrated R290 air-to-water heat pump, providing highly efficient, low‑carbon hot water for all‑electric homes and larger dwellings.

Product Description

The Mixergy iHP X 250L cylinder combines a Duplex stainless steel unvented cylinder with a top‑mounted R290 refrigerant 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. Connectivity to the Mixergy app enables machine‑learning schedules, time‑of‑use tariff optimisation and live hot water level monitoring.

Key Features

• Integrated R290 heat pump: Indoor air‑to‑water heat pump built into the cylinder head, no external heat pump unit required.
• High efficiency: Around 3.4 CoP and ErP A+ rating, significantly reducing running costs versus direct‑only cylinders.
• Fast hot water: Top‑down heating gives usable hot water in under 30 minutes, up to 10× faster than conventional integrated heat pump cylinders.
• Smart control: Mixergy app with machine learning, smart scheduling, Boost, usage insights and support for time‑of‑use tariffs.
• Large 250L capacity: Suited to larger households or higher hot water demand properties.
• Engineered to last: 25‑year cylinder warranty and 5‑year heat pump head warranty (typical Mixergy terms).
• Modular design: Cylinder and head supplied as two pieces for easier handling, retrofit or new‑build installations.

Technical Specifications

• Model: MX-250-IH2-579 – 250L Integrated HP R290 Smart Cylinder.
• Nominal capacity: 250 litres.
• Cylinder material: Duplex stainless steel.
• Refrigerant: R290 (propane), typical factory charge ~150 g.
• Heat pump electric rating: 0.55 kW.
• Heat pump max power output: 1.5–2.0 kW (datasheet and reseller data give 1.5 kW HP rating, 2 kW rated output figure).
• Coefficient of performance (CoP): 3.4 (test conditions as per Mixergy datasheet).
• Achievable hot water temperature (HP only): Up to 59°C.
• Back‑up immersion heater: 2–3 kW 1¾″ BSP (typically 3 kW listed on reseller spec; 2 kW minimum from datasheet).
• Standing heat loss: Approx. 0.54–1.75 kWh/24 h.
• ErP rating: A+.
• Electrical supply: 13 A, 230–240 V~ single phase.
• Air operating range: −7°C to +35°C ambient air.
• Sound power level: Around 50 dB.
• Air duct diameter: 150 mm, airflow approx. 500 m³/h.
• Water connections: 22 mm compression.

Dimensions & Weights

• Height: 2145 mm.
• Diameter: 580 mm.
• Weight (empty): 97 kg.
• Weight (full): 347 kg.
• Minimum reheat time (15–50°C): 30 minutes (top‑down partial charge).
• 70% charge reheat (15–50°C): Approx. 195 minutes.
• 100% charge reheat (15–50°C): Approx. 279 minutes.

Included Components

• Unvented kit: pressure reducing valve, check valve, pressure & temperature relief valve, expansion relief valve, tundish and expansion vessel (with mounting bracket and 3/4″ × 22 mm adapters).
• Immersion heater (2–3 kW, 1¾″ BSP, 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 larger all‑electric homes and high‑demand properties where external heat pumps are impractical or undesired.
• Suitable for retrofit or new build, fitting much like a standard unvented cylinder but requiring external wall ducting for air intake and exhaust.
• Supports smart tariffs and carbon‑conscious operation via app‑based optimisation and machine learning.
• Must be installed and commissioned by a G3‑qualified installer in accordance with Mixergy’s iHP X installation manual and local building regulations.