--- title: Nilan Compact P2 (GEO3 Polar) Review date: 2023-03-04T08:37:03+00:00 modified: 2025-10-29T10:01:53+00:00 image:: https://kaspars.net/wp-content/uploads/2023/03/nilan-compact-p2-ventilation-heat-recovery-scaled.jpeg permalink: https://kaspars.net/blog/nilan-compact-p2-geo3-polar post_type: post author: name: Kaspars avatar: https://reverse.kaspars.net/gravatar/avatar/92bfcd3a8c3a21a033a6484d32c25a40b113ec6891f674336081513d5c98ef76?s=96&d=mm&r=g category: - Electronics - Home Automation - Passive House --- # Nilan Compact P2 (GEO3 Polar) Review It is [a single unit](https://www.en.nilan.dk/products/ventilation-with-heating/ventilation-hot-water-production-and-heating/compact-p2-geo3) for ventilation with heat recovery and a heat pump against the exhaust air for heating or cooling the incoming air and producing domestic hot water, and another heat pump against ground loop for additional heating or cooling. [![Nilan Compact P2 ventilation crossflow heat exchanger](https://kaspars.net/wp-content/uploads/2023/03/nilan-compact-p2-ventilation-heat-recovery-scaled.jpeg?strip=all&quality=90&resize=2560,1920)](https://kaspars.net/wp-content/uploads/2023/03/nilan-compact-p2-ventilation-heat-recovery.jpeg)[Nilan Compact P2](https://www.en.nilan.dk/products/ventilation-with-heating/ventilation-hot-water-production-and-heating/compact-p2-geo3) ventilation crossflow heat exchanger with a heat pump against the outgoing air for heating and hot water production.## Components Here are the components for this particular unit (inspected manually or extracted from [the available documentation](https://www.en.nilan.dk/downloads)). Note that different production runs might be using different components. ### Air Filters [Nilan Greencycle filter](https://www.nilan.dk/produkter/tilbehoer/filtre/standardfilter-greencycle-iso-coarse-75-g4) (G4, ISO Coarse > 75%). ### Supply and Extract Air Motors D190mm Not confirmed, yet. ### Pre-Heating Element (Polar) RDT TW3 1500W 240V resistive heater coil in the back of the top-left incoming air chamber. ### Counter-flow Air Heat Exchanger [![Holtop 3D crossflow heat exchanger](https://kaspars.net/wp-content/uploads/2023/03/holtop-3d-cross-flow-heat-exchanger.jpg?strip=all&quality=90&resize=1516,1304)](https://kaspars.net/wp-content/uploads/2023/03/holtop-3d-cross-flow-heat-exchanger.jpg)Polyethylene terephthalate (PET) counterflow heat exchanger. Potentially [Holtop 3D](https://www.holtop.com/high-efficiency-3d-counter-flow-heat-exchanger.html) ([specification PDF](https://kaspars.net/wp-content/uploads/2023/03/Holtop-3D-high-efficient-counterflow-heat-exchanger-202106.pdf)). ### Bypass Damper [Belimo CM230-F rotary actuator](https://www.belimo.com/pl/shop/en_GB/Actuators/Non-Fail-Safe-Actuators/CM230-F-L/p?code=CM230-F-L) (orange device in the middle of the photo) controls the bypass damper — the cover for the cross-flow heat exchanger (the aluminium plate covering the green cross-flow heat exchanger in the top-left) and the square opening (to the right of the actuator) in the middle of photo connecting the incoming and outgoing air chambers. - [Belimo CM230-F datasheet PDF](https://kaspars.net/wp-content/uploads/2023/03/belimo_CM230-F-L_datasheet_en-gb.pdf) - [Belimo CM230-F installation instructions PDF](https://kaspars.net/wp-content/uploads/2023/03/belimo_CM..-F_installation-instructions.pdf) ### Air-Source Heat Pump [Danfoss SC15GHH reciprocating compressor](https://store.danfoss.com/en/Climate-Solutions-for-cooling/Compressors/Compressors-for-refrigeration/Light-commercial-compressors/Light-commercial-compressors/Reciprocating-compressor%2C-SC15GHH/p/104G8571) pumps the heat from the exhaust air (bottom left) to either the hot water tank *or* the incoming air. It is a high back pressure (HBP) compressor with a high condenser temperature of 55C to ensure it can heat up the domestic water using the R134a refrigerant. It’s heat output ranges from **345W at -15C** evaporator (is that the outgoing air *after* the counter-flow heat exchanger?) temperature (COP 1.26) to **1731W at 15C** evaporator temperature (COP 3.02) at EN12900/CECOMAF rating conditions: Evaporator Temperature, CCapacity, WPower Consumption, WCOP1517315733.021014055442.597.212485232.39511355052.2509114611.98-57264171.74-6.76704031.66-105703771.51-154353451.26which looks like this on a chart: ![SC15GHH heat pump capacity, power consumption and COP](https://kaspars.net/wp-content/uploads/2023/03/SC15GHH-capacity-power-consumption-cop.svg)SC15GHH heat pump capacity, power consumption (left axis) and COP (right axis).Prices online range from EUR 150 to 900. - [SC15GHH specification PDF](https://kaspars.net/wp-content/uploads/2023/03/SC15GHH-specification.pdf) - [SC15GHH connections PDF](https://kaspars.net/wp-content/uploads/2023/03/SC15GHH-connections.pdf) - [SC15GHH service guide PDF](https://kaspars.net/wp-content/uploads/2023/03/SC15GHH-service-guide.pdf) ### CO2 Sensor (Optional) ![Korea Digital SenseCube KCD-AN300 CO2 sensor](https://kaspars.net/wp-content/uploads/2023/03/sensecube-kcd_an300-co2-sensor.jpeg?strip=all&quality=90&resize=700,468) [Korea Digital SenseCube KCD-AN300](http://www.koreadigital.com/sensecube_product1?l=en) (RS-15-spec) ([sold by Nilan](https://www.en.nilan.dk/products/accessories/co2-sensors/co2-sensor)) with dual-wavelength NDIR sensor with 4-20mA / 0-10V analog or RS485 / PWM output. - [KCD-AN300 specification PDF](https://kaspars.net/wp-content/uploads/2023/03/KCD-AN-300_en.pdf) - [Available for purchase in EU](https://www.mb-systemtechnik.de/en/CO2-measurement/co2-meter-6-8-14-15.html) for EUR 94.