An HVAC system that uses water to transfer heat and includes a boiler, pipes, and radiators is called:
Correct Answer
D) A hydronic water-distribution system
The stated distribution system is hydronic because water carries heat through pipes to terminal units. A boiler is the specified heat source here; other hydronic systems may use heat pumps. Forced-air distribution uses air through ducts, and direct electric resistance does not use circulating water.
Why This Is the Correct Answer
Option D is correct because a hydronic system uses water to carry heat through pipes to terminal units such as radiators. In this case the boiler is the heat source. The defining feature is water as the heat-transfer medium.
Why the Other Options Are Wrong
Option A: A refrigerant distribution loop
Option A, a refrigerant distribution loop, moves refrigerant rather than water, as in many heat pump or air-conditioning systems, so it does not match a boiler with pipes and radiators.
Option B: A forced-air duct distribution system
Option B, a forced-air duct distribution system, moves heated air through ducts. The described system uses water in pipes, not air in ducts.
Option C: Direct electric resistance panels
Option C, direct electric resistance panels, generate heat electrically at the panel and do not circulate water from a boiler.
Hydro Means Water
Hydronic shares its root with hydro, meaning water, so it moves heat with water.
How to use: Use this word root to link hydronic systems with boilers, pipes and radiators.
Exam Tip
Focus on the heat-transfer medium named in the question. Water and radiators point to hydronic; ducts point to forced air.
Common Mistakes to Avoid
- -Calling a boiler and radiator system forced air
- -Confusing refrigerant loops with water loops
- -Assuming hydronic systems require a boiler
Concept Deep Dive
Analysis
This question tests identification of HVAC distribution types. A system that circulates water through pipes to radiators, heated by a boiler, is a hydronic system. The other choices use refrigerant, air through ducts, or electric resistance instead of water.
Background Knowledge
Heating systems are classified by the heat source and the way heat is distributed. Hydronic systems circulate water, forced-air systems move air through ducts, and electric resistance systems heat directly at the point of use. Appraisers describe these systems because they affect comfort, operating cost and market appeal.
Real-World Application
An appraiser inspecting an older house finds cast-iron radiators in each room and a boiler in the basement. The appraiser reports the heating as a hydronic system with a boiler and notes its observed condition.
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Under Fannie Mae Selling Guide B4-1.3-05, gross building area (GBA) is the total finished area including interior common areas based on exterior measurements; it is the most common comparison for two- to four-unit properties; it must include finished above- and below-grade living areas; and it cannot count exterior common areas such as open stairways. A two-unit subject has finished above-grade living area of 2,400 square feet and finished below-grade living area of 800 square feet (both measured consistently on an exterior basis, with interior common hallways already reflected in those exterior measurements). An open exterior stairway serving the units measures 90 square feet. What GBA should be used for comparison?