Fresh outdoor air all year round.
Fresh outdoor air all year round.
The TW4 decentralized Energy Recovery Ventilator transfers clean outdoor air inside and moves polluted air outdoors, while harvesting ~90% of the heat energy – so you get fresh air without the downsides of heating or cooling it.
The WM12 is basically two TW4 modules side by side in a piece of tough polypropylene foam, so you can put it in a window.
The design is now in beta. People who request a unit by email will be contacted one at a time as units become available, starting with those most able to handle potential complications that come with the beta phase.
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Provides fresh air during hot or cold weather, without allowing the loss or intrusion of (much) heat energy.
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Core performance figures:
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~90% sensible, ~80% latent heat recovery on medium speed. Slightly higher at low speed, slightly lower on max. This varies very little with temperature, humidity or season.
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High air flow – 60 CFM actual average net fresh air in heat recovery mode on maximum speed.
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Extremely quiet – ~0.25 Sone (~37 dBa) on medium, essentially inaudible on low, ~42.5 dBa on max.
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~21x greater rate of return on investment, compared with typical, conventional ductless ERV units, due to long term design, maintenance costs, higher energy recovery and other factors combined. ~3x the return on investment of typical ducted HRV/ERV units. >10x ROI of photovoltaic panels in many areas like Ottawa, Canada. See spreadsheet on learn more page for details.
Other details include:
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Optional HEPA (H13) filter, using widely available filters (requires the outdoor plate attachment and hood)
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Designed and built to last for >50 years, for greatly superior return on investment, with no long term component availability concerns.
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Can be configured to work with common home automation systems, including Google Home, Alexa and Home Assistant for scheduling, many kinds of sensor-based operation, interfacing with knobs and switches without wiring, etc using MQTT.
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Can be controlled over WiFi using MQTT, including from a phone.
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Very low electrical energy consumption – 2 watts on low, 7 watts at maximum power.
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Effectively reduces CO2 levels, reduces transmission of airborne pathogens and improves Indoor Air Quality in all metrics.
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Storm valve add-on to prevent intrusion of air or water during a storm (requires exterior plate and hood)
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Automatic wind compensation using a very nice pressure sensor, to ensure balanced air flow in both directions, and a precisely controllable influence on total net pressure in the building.
