Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-11C - State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Commercial › Section 51-11C-40410 - Section C404.11-Pools and spas

Current through Register Vol. 24-14, July 15, 2024
C404.11
Energy
			 consumption of pools and permanent spas.
The energy consumption of pools
			 and permanent spas shall be controlled by the requirements in Sections
			 C404.11.1 through C404.11.4.
C404.11.1
Heaters.
Pool water heaters using electric resistance heating as the
			 primary source of heat are prohibited for pools over 2,000 gallons. Heat pump
			 pool heaters shall have a minimum COP of 4.0 at 50°F (10°C) db,
			 44.2°F (6.8°C) wb outdoor air and 80°F (27°C) entering water,
			 determined in accordance with AHRI 1160. Other pool heating equipment shall
			 comply with the applicable efficiencies in Section C404.2.
The electric power to all heaters shall be controlled by an
				on-off switch that is an integral part of the heater, mounted on the exterior
				of the heater, or external to and within 3 feet of the heater in a location
				with
ready access
. Operation of such switch shall not change
				the setting of the heater thermostat. Such switches shall be in addition to a
				circuit breaker for the power to the heater. Gas-fired heaters shall not be
				equipped with constant burning pilot lights.
C404.11.2
Time switches.
Time
			 switches or other control method that can automatically turn off and on heaters
			 and pump motors according to a preset schedule shall be installed for heaters
			 and pump motors. Heaters and pump motors that have built-in time switches shall
			 be in compliance with this section.
EXCEPTIONS:
1. Where public health standards require 24-hour pump
						  operation.
2. Pumps that operate solar- and waste-heat-recovery
						  pool heating systems.
C404.11.3
Covers.
Heated pools
			 and permanent spas shall be provided with a vapor-retardant cover on or at the
			 water surface. Pools heated to more than 90°F shall have a pool cover with
			 a minimum insulation value of R-12, and the sides and bottom of the pool shall
			 also have a minimum insulation value of R-12.
C404.11.4
Heat recovery.
Heated
			 indoor swimming pools, spas or hot tubs with water surface area greater than
			 200 square feet shall provide for energy conservation by an exhaust air heat
			 recovery system that heats ventilation air, pool water or domestic hot water.
			 The heat recovery system shall be configured to decrease the exhaust air
			 temperature at design heating conditions (80°F indoor) by 36°F
			 (10°C).
EXCEPTION:
Pools, spas or hot tubs that include system(s) that
						  provide equivalent recovered energy on an annual basis through one of the
						  following methods:
1. Solar water heating systems not claimed in Section
						  C406.5 or C407;
2. Dehumidification heat recovery;
3. Waste heat recovery; or
4. A combination of these system sources capable of and
						  configured to provide at least 70 percent of the heating energy required over
						  an operating season.