Boilers & Hydronic Heating

Heat is distributed through your home through a variety of ways. Forced-air Furnace systems use ducts, and since these are also used for central air conditioning and for heat pump systems. Likewise, unique heat distribution systems are employed for radiant heating. That leaves two systems that apply broadly to heating systems: steam radiators and hot water radiators.

Steam Radiators

Steam heating is one of the oldest heating technologies, but the process of boiling and condensing water is inherently less efficient than more modern systems, plus it typically suffers from significant lag times between the boiler turning on and the heat arriving in the radiators. As a result, steam systems make it difficult to implement control strategies such as a night setback system.

The first central heating systems for buildings used steam distribution because steam moves itself through piping without the use of pumps. Non-insulated steam pipes often deliver unwanted heat in unfinished areas. Therefore, pipe insulation in these areas is usually very cost effective. Care should be used to install fiberglass pipe insulation that can withstand the high temperatures.

Regular maintenance for steam radiators depends on whether the radiator is a one-pipe system (the pipe that supplies steam also returns condensate) or a two-pipe system (a separate pipe returns condensate). One-pipe systems use automatic air vents on each radiator, which bleed air as steam fills the system and then shut automatically when steam reaches the vent. A clogged air vent will keep a steam radiator from heating up. Air vents can sometimes be cleaned by boiling them in a water and vinegar solution, but usually need to be replaced.

Hot Water Radiators

Hot-water radiators are one of the most common heat distribution systems in newer homes, second only to forced-air systems. They may be a baseboard-type radiator or may be of an upright design that resembles steam radiators.

One way to save energy in hot-water systems is to retrofit them to provide separate zone control for different areas of large homes. Zone control is most effective when large areas of the home are not used often or are used on a different schedule than other parts of the home. A heating professional can install automatic valves on the hot-water radiators, controlled by thermostats in each zone of the house. Using programmable thermostats will allow you to automatically heat and cool off portions of your home to match your usage patterns.

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