ComfoFond-L ECO

The Zehnder ComfoFond-L ECO subsoil heat exchanger is designed to complement Zehnder heat recovery units.

How does a sub-soil heat exchanger work?

The sub-soil heat exchanger uses the almost constant annual temperature of the earth at a depth of 1/1.5m. This store of energy stays at a temperature of 8 – 12 oC all year round and can be utilised to pre-cool or pre-heat incoming supply of air in summer and winter months.

When connected to a Zehnder ComfoAir 350/550 Luxe Systems it increases the comfort of the supply air to the dwelling throughout the year, even when the temperature fails below zero.  This can help improve the efficiency of the heat recovery units as the incoming air requires less energy to meet the desired comfort temperature.  By saving energy and providing an optimised indoor climate, benefits are felt by the building the homeowner and the environment.

Features and Benefits

  • Tempered supply air throughout the year
  • Operates automatically thanks to its integrated temperature sensor
  • Ideal for use in High-water table and extremely effective in water bearing sand/gravel and granite soil types
  • Exceptional energy efficiency due to utilisation of renewable energy from the ground
  • The system is low maintenance and all serviceable parts are easily accessible
  • Frost-free permanent operation, even at external temperatures of less than -25 oC
  • Zehnder ComfoFond-L Eco provides a closed loop system which offers improved hygiene over open loop versions
  • The closed loop system offered by Zehnder ComfoFond-L Eco delivers lower air resistance than an open loop system leading to lower running costs and enhanced efficiency
  • Design and supply from one manufacturer ensures compatibility and ease of integration


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