Electromechanical Time Switch - WH21

Electric Water Heater timer, 208-250VAC, 60Hz, SPST, 25A

Item WH21

Product Overview

[Image of Intermatic WH21 Electric Water Heater Timer: A rectangular device with a dial and push-pin levers on the front, labeled "ELECTRIC WATER HEATER TIMER" and "INTERMATIC". It displays a UL US certification mark.]

PRODUCT DESCRIPTION

With the easy-to-set push pin style levers, these time switches allow for basic control of electric water heaters. These time switches offer a minimum ON/OFF time of 30 minutes, and are available for 208-250 VAC applications. With the proven reliability of our mechanical line, these time switches provide dependable electric water heater control.

FEATURES

Two sets of ON/OFF trippers.
Enables shifting electricity use into off-peak hours to reduce energy costs.
Convenient external override switch.
Up to 12 ON/12 OFF events.
30-minute switching time.
External override push button.
SPST (Single-Pole Single-Throw).
25 A resistive load, 208-250 VAC, 60 HZ.
#14-10 gauge wire size.

APPLICATIONS

Agriculture Feeders
Greenhouse Misting Control
Water Heater Control

Technical Data

General

Model Number	WH21
Description	Electric Water Heater timer, 208-250VAC, 60Hz, SPST, 25A
UPC Code	078275007024
Brand	Intermatic
Country of Origin (Intermatic)	MEXICO
Warranty Period	1-Year limited

Control Specifications

Minimum ON/OFF Times	30 min
Maximum ON/OFF Times	2 hours
Operation Mode	24 hour
Mechanism Type	Analog/Mechanical
Has Manual Override	Yes
Has Override Switch	Yes
Application Compatibilities	Electric Water Heater

Mechanical Specifications

Enclosure Type	Indoor type 1 metal
Number of Trippers Included	1 ON/1 OFF

Dimensions

Product Dimensions (H x W x D) in	6.75 x 5.25 x 3.25 in
Wire Size Min	#14 AWG
Wire Size Max	#10 AWG
Knockout Dimensions Bottom	(2) combination 1/2" - 3/4"

Material Specifications

Color

Gray

Load Ratings

Resistive Load Ratings Ranges	21 A Max, 208-250 VAC, 60 Hz
Clock Motor Voltage	208-250 VAC, 60 Hz

Electrical Specifications

Wiring Option	Terminals
Input Voltage Range(s)	208-250 VAC, 60 Hz
Switch Type	SPST
Amps Per Pole	25 A
Watts Resistive	6250

Packaging

Shipping Weight (lbs)	2.245
Unit Carton Dimensions (H x W x L) in	6.751 x 5.251 x 3.251 in

Environmental Specifications

Temperature (operation)

-40 °F to 130 °F / (-40 °C to 54 °C)

Standards and Certifications

UL Certification	cULus
Other Certifications and Compatibilities	Green Energy
California Proposition 65	Lead
RoHS Certification	X

Accessories

156EB1945A: Trippers for E1020 (Pack of 2) [Image of two small plastic levers.]
48EB937: Spring - Cam Passivate for E1020, E1010, WH21 [Image of a small spring.]
48EB938: Spring - Cam Green for E1020, E1010, WH21 [Image of a small spring.]
WG233-18: Motor - 208/277 V 60 Hz with Leads [Image of a motor component labeled "PHOTO COMING SOON".]

	Intermatic WH21 Electric Water Heater Time Switch Installation and Operation Manual This document provides installation and operating instructions for the Intermatic WH21 Electric Water Heater Time Switch. It includes wiring diagrams, safety warnings, and programming guidance to help users set up and use the device efficiently.
	Intermatic T101P201/T101R201 24-Hour Time Switch with Fireman Switch Detailed guide for Intermatic T101P201 (plastic) and T101R201 (metal) 24-hour dial time switches with fireman switch functionality for pool heaters. Includes wiring, programming, and operating instructions.
	Intermatic EH10/EH40 Electronic Water Heater Time Switch Manual This manual provides installation, programming, and safety information for the Intermatic EH10 (120V) and EH40 (240V) electronic 7-day water heater time switches with battery carryover.
	Intermatic GM40AVE Series Electronic Time Switch Installation and Operation Manual This manual provides detailed instructions for the installation, operation, and troubleshooting of the Intermatic GM40AVE Series electronic commercial time switch, including electrical ratings, wiring diagrams, and warranty information.
	Intermatic ET1100 Series Electronic Time Switches: Features, Specifications, and Models Detailed information on the Intermatic ET1100 Series 24-Hour Electronic Time Switches, including features, technical specifications, contact ratings, enclosure options, and model variations for accurate load control.
	Intermatic T100 Series Electromechanical Time Switches Overview of Intermatic T100 Series heavy-duty electromechanical time switches, detailing features, specifications, ratings, and model options for industrial, commercial, and residential applications.
	Intermatic GM40AVE-RD89 Electromechanical Commercial Time Switch Installation & Operation Manual Comprehensive installation and operating instructions for the Intermatic GM40AVE-RD89 electromechanical commercial time switch. Includes electrical ratings, wiring diagrams, installation steps, programming guide, and application details.
	Intermatic EJ351 Indoor Wall Switch Timer: Installation, Programming, and Troubleshooting Guide Comprehensive guide for installing, programming, and troubleshooting the Intermatic EJ351 Indoor Wall Switch Timer. Learn how to set schedules, use automatic and manual modes, and resolve common issues.