Always bring helpers
is a self-help site
|Cost to operate water heater||Figure Volts Amps Watts for water heater||How to wire tankless electric||
|Compare 16 electric and 3 gas water heater timers||Troubleshoot Rheem tankless||Clean sediment out of water heater
||9 ways to save with water heater||
|How electric water heater works||Troubleshoot electric water heater||Troubleshoot-gas water-heater||Troubleshoot Bosch tankless||Do-it-yourself|
Search waterheatertimer.org / all results
|Z-wave countdown timer|
|Horsepower rating on electrical device|
Timers, contactors, switches, etc all have a amperage rating.
Timers intended for use on motor loads also have a horsepower rating
The horsepower rating makes it easy to select correct timer.
But many electrical devices do not have a HP rating, and give only amp rating.
Other devices specify they cannot be used for inductive (motor) loads.
Always read product manual for specifications
|Calculate amp rating of motor|
Motors use more amperage when starting. This is called inrush and occurs for a fraction of a second. The extra amperage is needed to 'set up a magnetic field surrounding the motor and overcome lack of angular momentum of motor and load.'
Inrush can be calculated within a range using information from the motor nameplate.
The nameplate should show Voltage, Locked Rotor code per horsepower, and HP.
Using NEMA Locked Rotor Code Table, locate letter code that matches motor nameplate. Codes generally follow the alphabet with A having the lowest starting current (current = amps). The range will be two numbers such as 4.5 to 5.6 for letter D.
Multiply each number times 1000, then divide each number by Voltage to find range of inrush per HP.
|Delay timer wiring
How to wire AH3 delay timer
How to wire pin timers
|Leviton WSS10-GDW Wireless
Works with occupancy sensor
Momentary switch can activate delay timer like Dayton shown below
Leviton momentary switch at Amazon
How to wire AH3 delay timer
Buy water heaters from my associate links:
50 gallon Gas water heaters at Amazon
40 gallon gas water heaters at Amazon
50 gallon Electric water heaters at Amazon
40 gallon electric water heaters at Amazon
Hybrid / heat pump/ water heaters at Amazon
How to install gas water heater
How to install electric water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Point of use water heaters
Tools and home improvement
Home and garden
Black and Decker
Irwin Hand tools
Klein hand tools
Fluke electrical testing
Dremel hobby tools
Campbell Hausfeld air powered
Saws and saw blades
Compare box timers
Control water heater w/ Z-wave
Intermatic control centers: and parts
Digital control centers and parts
Tork control centers and parts
All control centers and parts
Off delay timers
On delay timers
Twin & one-shot
|Enter Amazon from
My response might end up in spam folder, check email folders