Certified Facility Manager (CFM) Practice Exam

Which heating system option is generally considered the most expensive for water heating?

1. Gas boiler

2. Heat pump

3. Solar heater

4. Electrical resistance

The correct answer is: Electrical resistance

The choice of electrical resistance heating systems is considered the most expensive option for water heating due to the high cost of electricity compared to other energy sources. Electrical resistance heating works by using electric currents to directly heat the water, which can lead to significantly higher energy bills, especially in regions where electricity prices are elevated. In contrast, gas boilers typically operate at a lower cost due to the generally more affordable nature of natural gas. Heat pumps, while initially more expensive, are often more energy-efficient, which can offset their higher upfront costs over time through lower operating costs. Solar heating systems can have significant initial installation costs but, depending on sunlight exposure and local incentives, can provide very low operating costs, making them a more economical long-term option.