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Radiantec’s Closed System

Radiantec’s Closed System uses a high efficiency water heater or boiler to heat water or another heating fluid such as anti-freeze. The heating fluid is self contained within the system and stays there unless removed for maintenance – completely separate from the domestic hot water. When radiant heat is called for by the thermostat, a pump comes on and circulates the warm water throughout the radiant floor until the thermostat is satisfied.

Closed System


  1. Very well accepted by code officials because the domestic hot water is completely separate.
  2. Easy to have a combination of high temperature applications such as baseboard and low temperature applications such as radiant heat.
  3. Mechanically very simple.
  4. Anti-freeze can be used if desired.
  5. Having redundant systems can be beneficial; if your radiant heat fails, you still have hot water for showering and vice versa


  1. Slightly more expensive than the Open Direct System because you need a separate water heater for domestic purposes.
  2. Free cooling benefit is eliminated
  3. Oxygen barrier tubing is often required if a boiler is used.
  4. The system may not be quite as efficient if a boiler is used. See water heater vs. boiler

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Closed System Example

Closed System Example

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