![]() ![]() In cold climates, it should be 2 inches thick at the perimeter. Insulation should be extruded polystyrene. Our research shows that under slab insulation is most important at the perimeter and less important in the center of the building. Thinner aluminum plates have equivalent performance as thicker plates with half the cost. The plates support the tubing well and the improved heat transfer is significant. Research shows that this detail is very important. The aluminum plate takes heat away from the tubing and distributes it throughout the sub floor. Tubing that is larger than 5/8″ may be too difficult to work with. The larger size reduces pump work and allows longer circuits. It puts out more heat and allows the system to operate with lower fluid temperatures for longer life and better efficiency. The 5/8″ tubing is larger than typical 1/2″ material. Use thinner gauge aluminum heat emission plates and use them everywhere if possible. Space the tubing 8″ apart within a 16″ joist space. ![]() ![]() We suggest that you heat the floor with tubing installed in the underfloor joist spaces beneath the sub floor. The following details are very important for performance and cost. Many joist installed systems on the market do not work very well, or cost too much. Photograph of a Joisted Floor System “Staple-Up” It is up to you to consider the source of any negative comments. We have the science and happy customer feedback to back up our hydronic systems. These systems are sometimes labeled “controversial” by people in the heating industry that want to sell you an old-school boiler system that costs 2 to 3 times as much. Domestic hot water heater based heating systems are even compatible with a solar energy assist. Since the expense of a boiler is entirely eliminated, these systems are more affordable as well. Because these systems operate at low temps they are more energy efficient and safer than systems using a boiler. Properly designed domestic hot water based systems meet all major codes and are exceptionally safe. They are a simple, ingenious way to make radiant space heat and domestic hot water within the same unit. They are generally made of better materials. Heating systems utilizing a water heater cost about half as much as those using a typical boiler. These radiant heating systems are arguably theīest and most efficient heating systems available. Significant amounts of the pollutants will dissolve in the water and they go harmlessly down the drain instead of polluting the air.Ĭlick here for more information about radiant systems that use the domestic hot water heater as the heat source. IF YOU CONDENSE THE STEAM IN THE EXHAUST DOWN TO WATER, YOU CAN PICK UP ANOTHER 10% IN EFFICIENCY.Open Direct System Environmental Benefits: The tank enables a huge heat exchanger for the flue which enhances efficiency.Cold water pre-heat provides limited free cooling by the detail where cold replacement water passes through the tubes in the floor before it goes to the tank.Be aware that these benefits are only available with quality water heaters and may not be realized with cheap models. They can operate at low temperatures and they enable condensation of the flue gasses. Domestic water heaters are potentially more efficient than a boiler.The “Open Direct System” is compatible with solar.Lower first cost presents the opportunity to buy a better, more efficient unit.One set eliminated and the other reduced because of efficient utilization. Dual use designs have less than ½ the standby losses of two independent methods.The “Open Direct System” uses radiant heating which is fundamentally more energy efficient.Open Direct System Energy Efficiency Benefits: You are literally getting a much better system for a lot less money. It is one of the very few exceptions to the rule that better things cost more. It is arguably the most energy efficient and environmentally friendly heating system in the world. When domestic hot water is wanted, water flows out of the tank and goes to the fixture. When floor heat is called for, the pump comes on and water flows out of the tank, through the radiant floor heating zone and back to the tank. It is one single system that operates in two different and distinct ways. The Open Direct Radiant System offers unprecedented efficiency with a highly affordable first cost and is our preferred system of all radiant heating systems. The “Open Direct System” is a significant breakthrough in radiant heating design. One is the indirect system that uses a heat exchanger and the other is the direct system that does not. There are two systems to choose from that provide domestic hot water and space heating from the same unit. You can use the same water heater for your radiant heating system that you use for domestic hot water! ![]()
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