Together with partner groups, we submitted joint comments to the Department of Energy (DOE) on its proposed rule to strengthen energy conservation standards for commercial water heating equipment. Our comments applaud the agency for appropriately applying the social cost of greenhouse gases to estimate the climate benefits of the proposed standards, even though the standards would be cost-benefit justified without considering any climate benefits. We also encourage DOE to expand upon its rationale for adopting a global damages valuation and for the range of discount rates it applies to climate effects.