Final answer:
The information that must be collected for drain water heat recovery units (DWHR) includes manufacturer name and model number, installation date and location, and annual energy consumption.
Step-by-step explanation:
The information that must be collected for drain water heat recovery units (DWHR) includes:
- Manufacturer name and model number: This information is necessary to identify the specific DWHR unit being used, as different models may have different specifications and performance characteristics.
- Installation date and location: This information helps in evaluating the longevity and performance of the DWHR unit, as well as identifying any potential issues related to installation.
- Annual energy consumption: Measuring the annual energy consumption of the DWHR unit allows for a comparison of its efficiency and energy-saving benefits.
Therefore, the correct answer is D) All of the above, as all of the mentioned information is necessary when collecting data about DWHR units.