A Description of Several Types of Radiant Systems
Including Our Preferred System.
There are many ways to take advantage of the benefits of radiant heating and cooling. Some heating system concepts are at least 100 years old. Other systems are newer and more innovative. We urge you to at least take a look at these modern systems. The newer and more innovative systems can offer significant advantages.
Please note that Radiantec often recommends the use of domestic water heaters instead of expensive boilers. Click here for more information about that use. This is an opportunity to save thousands of dollars and still have a better and more energy efficient radiant heating system.
THE OPEN DIRECT SYSTEM
(both heat and domestic hot water are provided directly from the same heating unit)
The Open Direct System is Radiantec’s preferred system because it offers unprecedented efficiency with a highly affordable first cost. It is one single system that operates in two different and distinct ways. When heat is called for, the pump comes on and water flows out of the tank, through the heating zone and back to the tank. When domestic hot water is wanted, water flows out of the tank and goes to the fixture. All water in the system is rated potable.
System is Radiantec’s
because of these
Because of great simplicity, use of a water heater for dual purposes, no boiler, fewer parts, easy installation and energy efficiency.
EASY TO INSTALL
Because of fewer parts and great simplicity.
EASY TO WORK ON
Because of great simplicity, common parts.
EASY TO MAINTAIN
Because of great simplicity, low temperatures and long lasting materials.
EASY TO GET PARTS FOR
Because of simplicity and common parts.
Because of common use of the domestic water heater and great simplicity.
Because of fewer moving parts, great simplicity, lower temperatures, stainless steel quality.
Because of low temperatures and stainless steel construction.
Because of radiant heating, low temperatures and condensation of the flue gasses, limited free cooling.
Because of condensation of the flue gasses, limited free cooling.
COMPATIBLE WITH SOLAR
Because of domestic hot water based design.
DO IT YOURSELF FRIENDLY
Because of great simplicity.
See your sales tech.
Because of low temperatures, lack of boiler and great simplicity.
THE INDIRECT HEATING SYSTEM FROM RADIANTEC
(heating is provided indirectly by means of a heat exchanger)
When heat is called for, domestic hot water is pumped to the heat-exchanger where the heat is transferred to the heating fluid on the other side. At the same time, the heating zone pump(s) comes on and circulates the heating fluid where it is needed.
The heating fluid is separated from the potable water supply by means of the heat exchanger. A non potable heating fluid such as anti freeze can be used.
THE CLOSED HEATING SYSTEM FROM RADIANTEC
(This “traditional” system uses a boiler or water heater to heat water)
This system, dedicated exclusively for space heating, uses a boiler or water heater to heat water (or an antifreeze solution) which is circulated through the in floor tubing. This is a familiar and conventional approach that is well accepted by building code officials when a boiler is used.
Radiantec Company supports the use of solar energy whenever it is feasible and notes that solar efficiency has improved greatly in the past few years. The following graphic represents a solar domestic hot water based solar system that is particularly appropriate for radiant heating systems.
For more information on Radiantec’s solar technology, visit www.radiantsolar.com
Understanding the meaning of the following phrases will make it easier to understand your heating system options.
A boiler is a heating device that is engineered to make very hot water (up to 250 degrees F, under pressure) for radiators and baseboards. Many boilers do not work well at lower temperatures and may need expensive controls to make the adjustment.
DOMESTIC HOT WATER HEATER
A domestic water heater is engineered to make moderate temperature water. A storage tank is often provided, and additional precautions are taken to prevent corrosion. There is a potential for higher efficiency with a hot water heater because of lower operating temperature and lower exhaust gas temperature, but many low end water heaters do not take advantage of this potential.
A heat exchanger is a device that exchanges the heat from one fluid to another without a mixing of the fluids. A typical use would be to keep the potable domestic hot water separate from the boiler fluid.
A closed heating system is one which is closed off from the environment and its heating fluid is not changed except for maintenance.
An open system is one that is open to the atmosphere or one in which the heating fluid is replaced often. A domestic hot water heater is an open system because the heated fluid is constantly changed. Open systems require different mechanicals and materials.
Potable means fit to drink.
A direct system is one in which the potable hot water in the water heater is used for space heating and domestic hot water for doing dishes, laundry, taking showers, etc. There is no separation between the two.
An indirect system is one in which the heat from the heating unit passes through a heat exchanger before it goes to the in floor tubes.