Final answer:
Hot water boilers eliminate the need for auxiliaries such as steam traps, condensate tanks, and D.A. tanks that are required in steam boilers.
Step-by-step explanation:
In a comparison between hot water boilers and steam boilers, when using hot water boilers, auxiliary systems such as steam traps, condensate tanks, and D.A. tanks are eliminated. These auxiliaries are needed in steam boilers to manage the condensation and collection of water generated during the steam generation process. However, in hot water boilers, there is no need for these auxiliaries as the system operates with water at lower pressures compared to steam boilers.