"The counter-flow heat exchanger is part of what sets the Zehnder HRVs and ERVs apart. This is why they achieve up to 90+ percent recovery efficiency, which is much higher than units using cross-flow exchangers."
"New technology will continue to bend the curve on these models. Vermont Energy Investment Corp (VEIC), Northwest Energy Efficiency Alliance (NEEA) and others are developing these models, with HRVs/ERVs operating at .3 watts/cfm and with 90%…"
"I am surprised that you are having this issue in Germany. They are well ahead of North America in both efficiency of units, and proper installation. The HRV should have a defrost mode, either with unbalancing motors to provide more exhaust than…"
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