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Closed System

This system uses a high efficiency water heater or boiler and the heating fluid is self contained within the system and stays there unless removed for maintenance. The heater warms the water or another fluid such as anti-freeze. When heat is called for by the thermostat, a pump comes on and circulates the warm water throughout the floor until the thermostat is satisfied.


Animation illustrating the functionality of a closed heating system.

Legend for Closed Direct Heating System animation



ADVANTAGES

  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.
  3. Mechanically very simple.
  4. Anti-freeze can be used if desired.
  5. Having redundant systems can be beneficial; if your heat fails, you still have hot water for showering and vice versa.

ISSUES

  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

Photograph

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Open Direct System
Installing the Closed System
Installing the Indirect System
Installing tubing for a concrete slab
Installing tubing between floor joists
Installing tubing in the ceiling
Installing tubing in the walls
Installing a heated towel rack
Installing Radiantec Controls
Doing your own tubing layout.
Radiantec Basic Solar Domestic
   Water Heater Installation Manual.

Radiantec Basic Solar Domestic
   Water Heater Owners Manual.



tubing background