By Barry Stone
Dear Barry,
The heating system in our home consists of hot water pipes in the floor, connected to a gas-burning water heater. The system was installed more than 40 years ago and we suspect it is not efficient. In particular it takes about five hours to heat the house. Our first question is how can we verify the condition of the system? And second, how can we calculate the normal heating cost for a home of this size?
--Lev
Dear Lev,
Old hydronic heating systems such as yours are typically not efficient because they were installed in an age when fuel costs were nominal and energy saving was not a serious consideration. The most common problem with these aging systems is leaking due to deteriorated pipes or fittings. If you have not yet experienced leakage, don't be surprised if it occurs in the future.
To verify the condition of the system, the water heating fixture can be evaluated by a licensed HVAC contractor or plumber, but the condition of the hydronic piping probably cannot be determine because the lines are not accessible for inspection. An HVAC contractor can advise you further in this regard.
To calculate the normal expected heating cost for your home, contact your gas company. Most natural gas suppliers provide energy audits. They can advise you regarding the average heating costs for a home of a particular size, while considering the heights of ceilings, the types of windows, and the amounts of insulation in walls, ceilings, etc.
Hydronic heating systems, whether new or old, are not designed to heat a home quickly. Their strong point is maintaining a constant, even temperature once the home is heated.
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