Zehnder EVO 3 Compact Heat Recovery Unit - 471100161

Class-leading 91% heat recovery and 0.5 W/l/s Specific Fan Power Ultra-compact 269 mm depth — fits a standard suspended ceiling void 100% full and filtered automatic summer bypass Wall or ceiling mountable, left or right hand Rotatable spigots for flexible duct routing Tool-free filter access Wireless RF control as standard, ModBus/KNX BMS options Passive House certified The Zehnder EVO 3 is the efficiency sweet spot of the EVO range — same compact 269 mm casing as the EVO 4 but with optimised motors and aerodynamics that deliver up to 91% heat recovery at just 0.5 W/l/s SFP. For 2–3 bed apartments and small houses that don't need the EVO 4's 322 m³/h headroom, the EVO 3 is the lower-running-cost choice. EC motors hold a constant commissioned flow rate as the filters load, so Part F duty is maintained between filter changes. The summer bypass is fully filtered — pollen and particulates stay out during warm-night purge — and at 38.6 dB(A) on full boost it's the quietest unit in the EVO family. The integrated condensate fall lets you ceiling-mount without packing or shims. Four variants available: standard, factory-handed pre-heater (for external temperatures below -10°C), mirror-handed pre-heater, and an enthalpy exchanger version that recovers moisture as well as heat. Suitable for 2–3 bed apartments Small houses New builds Retrofit projects where heat recovery efficiency and running cost matter more than maximum flow rate. Installation Wall or horizontal ceiling mounting. Integrated condensate fall — no shimming required. 160 mm internal duct connections, rotatable spigots. Wired by a qualified electrician via the supplied flying lead. Specifications Brand Zehnder Air flow range 116–231 m³/h Heat recovery efficiency 91% max (SAP 2009) / 90% (SAP 2012) Specific Fan Power 0.5 W/l/s SEC class A+ Dimensions (L × W × H) 1160 × 600 × 269 mm Weight 36 kg Duct connection 160 mm internal, rotatable Filter grade ISO Coarse G4 (ISO ePM1 F7 upgrade available) Voltage 230 V / single-phase / 50 Hz Max power (with / without pre-heater) 1168 W / 168 W Sound at full speed 38.6 dB(A) @ 3 m IP rating IP40 Certification Passive House certified, BS EN 13141-7:2010 Warranty 2 Year Manufacturers Manuals & guides Zehnder EVO 3 Product Data Sheet