Zehnder ComfoAir 375 HRV heat recovery ventilation unit

ComfoAir 375 HRV description

Zehnder ComfoAir 375 HRV is a heat-recovery ventilation unit (HRV) that continuously supplies fresh air throughout the building while recovering heat from the exhaust air. Zehnder is a Swiss manufacturer known for premium quality and extremely reliable AHUs. The ComfoAir 375 HRV model is designed specifically for private houses where maximum energy saving matters most, where both energy savings and quiet operation matter.

How Zehnder ComfoAir 375 HRV works

The unit draws fresh air from outside while simultaneously extracting stale air from the rooms. A counterflow plate heat exchanger transfers heat from the exhaust air to the incoming fresh air without the two streams mixing. The result is fresh, filtered supply air that in winter arrives at almost room temperature. This significantly reduces heating costs — often 30–50% compared to natural ventilation. ComfoAir 375 HRV uses a counterflow plate exchanger optimised for maximum energy saving — heat recovery efficiency reaches 90%.

Energy efficiency and indoor climate

Zehnder ComfoAir 375 HRV suits objects of up to 180 m² and is designed to deliver the highest possible heat recovery. Supply air is filtered — typically with an F7 or better filter — which stops pollen, dust and fine particles (PM2.5). It is especially valued by allergy sufferers and families with young children. Filtered air keeps indoor CO₂ levels low, reduces moisture in bathrooms and kitchens, and prevents mould.

Control and automation

This means the unit runs only as much as needed — saving electricity and extending filter life.

Why choose Zehnder ComfoAir 375 HRV

Zehnder is well known on the Estonian market for quality, durability and long-term spare-parts availability. ComfoAir 375 HRV is a popular choice thanks to its strong price-to-performance ratio and easy maintenance. We sell the unit together with professional installation across Estonia, including design, ductwork, commissioning, balancing and ongoing service and filter changes.

ComfoAir 375 HRV technical specifications

Who is Zehnder ComfoAir 375 HRV for?

Well suited for properties with up to 180 m² of living space.

• Private house 120–180 m²
• A-class new build
• Renovated house seeking the best heat recovery
• House where moisture recovery is not needed

Frequently asked questions