When installing an indirect-fired water heater, what is the primary advantage of connecting it to a high-efficiency hydronic boiler system?

Question: When installing an indirect-fired water heater, what is the primary advantage of connecting it to a high-efficiency hydronic boiler system?

Answer options: ✅ It leverages the boiler's existing heating capacity, often resulting in lower operating costs.

• It eliminates the need for an expansion tank in the domestic hot water system.
• It allows for the use of unvented combustion gases for water heating.
• It simplifies the overall plumbing by requiring fewer circulating pumps.

Correct answer: It leverages the boiler's existing heating capacity, often resulting in lower operating costs.

Explanation: Indirect-fired water heaters utilize the heat from an existing hydronic boiler to heat domestic water. This often results in lower operating costs because modern boilers are very efficient and the boiler's energy is used for two purposes (space heating and DHW). An expansion tank is still necessary. It does not use combustion gases directly, and can add complexity with additional pumps and controls.