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Energy Code Tips – New & Updated

Our new Tip 424, Heat Pump Water Heating for Commercial and Multifamily Buildings, has been posted on the SDCI Tips page. For permit applications filed beginning January 1, 2022, central domestic water heating systems in hotel and multifamily buildings must utilize heat pumps, rather than conventional gas or electric resistance systems. (In December, City Council will consider extending this requirement to include other commercial buildings with substantial water heating loads. That requirement, if approved, would take effect later in 2022.)

Heat Pump Refrigerant Line Insulation Requirements Under Seattle Energy Code

Recently there has been confusion on interpreting the insulation requirements for refrigerant lines connecting the indoor and outdoor units of heat pumps.  The following are SDCI’s requirements for insulating refrigerant lines and how they differ between residential buildings and commercial buildings.