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EH40 timer
Larger image/      Read about surge protectors

EH40
Large image of 240 Volt EH40

All Intermatic timers- manuals

Intermatic EH40 240Volt/ 7-day programmable / 7 programs/ 30 amp for 1 water heater/ external override until next programmed setting/ battery back-up

Size A battery located below programming buttons, lasts 3 years
Made for resistive loads like water heater/ For inductive motor loads etc see ET1100 and ET1700 series
30 amp up to 5500 watt non-simultaneous 240Volt/ to check your heater, look at label on side of tank
>7-day programmable > 7 TOTAL PROGRAMS
> 1 minute minimum on-off times/ Indoor box
> Each days of the week can be different > no memory loss with power outage > 3-year back-up battery
No repair parts are offered for digital timers > Reset after power surge
On-line and phone support from Intermatic.com
Buy 240 volt/ 7-day:
Intermatic EH40 timer at Amazon
Resources:
240V EH40 manual
Figure volts amps watts of water heater
How to wire EH40 water heater timer

EH40 water heater timer
120Volt timer
Same appearance as EH40 above
All Intermatic timers- manuals

Intermatic EH10    120Volt   7-day programmable

Size A battery located below programming buttons, lasts 3 years
>7-day programmable > 7 TOTAL PROGRAMS
> 1 minute minimum on-off times/ indoor box
> Each days of the week can be different > no memory loss with power outage > 3-year back-up battery
No repair parts are offered for digital timers > Reset after power surge
On-line and phone support from Intermatic.com
Buy 120 volt/ 7-day:
Intermatic EH10 timer at Amazon
Resources:
120V EH10 manual
Figure volts amps watts of water heater

How to wire 120Volt EH10 water heater timer
wifi relay

WiFi relay

Woods 50054/ 30-40 amp DPDT

Auto detect voltage/ 120, 208, 240, 277 volt
Outdoor metal box with 3 knockouts for 1/2" or 3/4", located on sides and bottom.
Illustration shows test wire at my house before installation.
NO NC terminals/ DPDT

Buy from my links
Woods WiOn contactor from Amazon

Resource:
How to wire and install wifi relay
water heater timer
Large image of 240Volt WH40
Same as T104 except with convenient override lever
Larger image

All Intermatic timers- manuals
All T100 series timers

Intermatic WH40 208-240Volt /10000watt /40 amp/ DPDT/ 24-hour / override on front of unit

40 amp up to 9000 watt non-simultaneous 240Volt/ to check your heater, look at label on side of tank
> 24 hour dial/ add up to 12 sets on-off trippers/ 2 sets on-off trippers arrive with product
> 1 hour minimum on-off time/ indoor box
Repair parts are widely available
On-line and phone support from Intermatic.com
Buy 240 volt/ 24 hour:
WH40      208-240-277Volt 10000 watt 40 amp at Amazon
T104-20 (WH40)     208-240-277V (same as WH40 except no external override) at Amazon
Repair parts
156T1978 trippers at Amazon
Replacement trippers at Amazon
Clock motor WG1573 at Amazon
Resources
WH40 manual
WH40 sell sheet
How to operate and set timer
List of replacement parts
Photos of WH40 timer internal parts and maintenance

How to wire WH40 
WH40 wiring
water heater timer
Nema1 indoor
T 104R
Larger image nema 3R indoor-outdoor

More T100 series timers including pool timers

Intermatic T104 series 208-240Volt /10000watt /40 amp/ DPDT/ 24-hour/ override located inside unit/ choose T104 indoor box or T104R outdoor metal box, T104P outdoor plastic box

More box choices available: See full list of models (sell sheet pdf)
Exactly same timer as WH40 except override located inside box
40 amp up to 9000 watt non-simultaneous 240Volt/ to check your heater, look at label on side of tank
> 24 hour dial/ add up to 12 sets on-off trippers/ 2 sets on-off trippers arrive with product
> 1 hour minimum on-off time/ indoor box
Repair parts are widely available
On-line and phone support from Intermatic.com
Buy 240 volt/ 24 hour:
T104         208-240-277V Grey metal indoor box Amazon
T104R    Grey metal outdoor box Amazon
T104P     Grey plastic outdoor box Amazon
T104PCD82    Grey plastic see thru door
T104M mechanism only/ no box (cheaper to buy T104)
T104R3 Beige plastic outdoor box
T104P3 Beige plastic outdoor box
More T100 series timers including pool timers
Buy repair parts
156T1978 trippers at Amazon
Replacement trippers at Amazon
Clock motor WG1573 at Amazon
All available parts
Resources
T104 manual
T100 series sell sheet
Complete parts list
Pool timers
How to set and operate T100 series
How to wire T104 series (includes all models: T101, T012, T013, T0104, T105, T106 etc)   
WH40 wiring
Intermatic T104P201 timer Pool timers and manuals and parts

Larger image T170 series

All Intermatic timers- manuals

Intermatic T174 series same as above except with day-skipper

Same as T104 above/ except with day-skipper
Repair parts are widely available
On-line and phone support from Intermatic.com
Buy 240 volt/ 24 hour
T174           208-240-277 Volt SPDT at Amazon
More T170 skip-a-day series timers
Resources:
More information on T170 series
Complete parts list
Sell Sheet with model numbers
How to wire T170 series/ identical to T104 and WH40 above
WH40 wiring
WH21 timer
Larger image

All Intermatic timers- manuals

WH21  / TL11  /  240volt / 23 amp/ maximum 4500 watt water heater

Minimum 1/2 hour on-off times.
On trippers cannot be set closer than 2 hours
25 amp controls up to 5000watt water heater
SPST 240Volt
Red indicator light is ON when Load is ON
Replacement parts are availableUnknown warranty support/
Buy 240 volt/ 24 hour:
WH21      240Volt 23 amp at Amazon
156EB1945a replacement trippers at Amazon
WH21 clock motor WG233-18 from Intermatic
Manuals/ Resource:
WH21 manual
Troubleshoot WH21 timer
More Intermatic trippers and parts
How to wire WH21/ illustration
WH21 wiring
Tork water heater timer
Larger image
Tork EW 103B

All Tork digital timers- manuals

Tork EW103B 7-day digital Programmable/ 20 set points per week

> 120 Volt or 240 Volt water heater timer
> 20 set points per week > each day can be different > 1 minute minimum
> Capacitor back-up: no memory loss with power outage
No replacement parts are offered
/ warranty support support through NSI
Buy 120-208-240-277 volt/ 7-day:
Tork EW103B DPST 120-208-240-277Volt at Amazon
More EW series 7-day models
Resources:
E-EW100B wiring manual
EW100B sales sheet with models and wiring
See all Tork timers
EW series instruction/programming manual
How to wire EW103B

EW103B water heater circuit

Steel outdoor box
Larger image


Plastic outdoor box w/ see thru door
More ET series timers

ET1700 series / 30 amp timer/ DPST/ 7-day programmable/ 28 set points (14 ON- 14 OFF)

Arrives with default 120Volt, choice of output 120, 208, 240, 277V
Set selector switch to 240 for water heater/ can be used for motor loads and water heaters etc
Retains programs after power loss/ choice of box types for indoor and outdoor
No repair parts are offered for digital timers
On-line and phone support from Intermatic.com

Buy 120-208-240-277 volt/ 7-day:
ET1705C/            Steel indoor box/ 30 amp/ 7-day/ SPST programmable/ at Amazon
ET1705CPD82/   Plastic outdoor box w/ see-thru door/ 30 amp
ET1705CR/          Steel outdoor box/ 30 amp

ET1725C               Steel indoor box/ 30 amp / 7-day/ SPST or DPST
ET1725CPD82      Plastic outdoor box w/ see thru door/ 30 amp
ET1725CR             Steel outdoor box/ 30 amp

Resources:
ET1700 series sell sheet with model numbers and features
ET1715C manual
ET1725C manual

More ET series timers/ including 24-hour ET1100 series, and ET1800 astronomic series
Tork DTU water heater timer
Larger image
Tork DTU40 digital timer
All Tork digital timers- manuals

Tork DTWH40 and  DTU40 40 amp/ programmable/ 120-208-240V auto detects voltage

40 amp timer in Nema3 outdoor enclosure/ Nema 1 indoor box
Automatically detects voltage/ no dip switches
7-day programmable timer/ Minimum 1 minute schedule
Versatile wiring options/Ni-MH Battery Type
No replacement parts are offered
/ warranty support offered through NSI
Buy 120-208-240-277 volt/ 7-day:
DTU40 120-208-240-277V electronic timer with override located on timer module/ outdoor box/ Amazon
Resources:
Sell sheet
Tork DTU40 timer instructions
More Tork digital timers
How to wire Tork DTU timer
Large image of 240Volt wiring
Tork-DTU40 wiring
Tork TU universal timer
Tork TU-40 Universal Timer
All Tork timers and manuals

Tork TU Universal timer for 120V-208V-240V/ auto detects voltage

40 amp timer in Nema3 outdoor enclosure
Automatically detects voltage/ no dip switches
24-hour dial/ Minimum 15 minute schedule
Versatile wiring options
No replacement parts are offered
/ warranty support offered through NSI
Buy 120-208-240-277 volt/ 24 hour:
Tork TU series universal timer at Amazon
Resources
Large image of 240Volt wiring
Tork TU manual
Tork TU and other Tork mechanical timers
Large image of 240Volt wiring
GE 15146 timer
Larger image

All GE timers and manuals

GE 15146    240volt/ 40 amp  24 hour /indoor metal box/ same as Tork above

24 hour-240Volt, Same as Tork 1104/ 240Volt clock motor
Buy 240 volt/ 24 hour:
GE 15146 timer/ /indoor box/ at Amazon
Tork 1104 208-277Volt DPST at Amazon
Tork 1102 208-277 SPST at Amazon
Tork P47 trippers at Amazon
#101 120Volt clock motor
#201 208-277Volt clock motor
Resources:
Tork 1100 series timer and manuals
Control 277 volt or two 240Volt GE 15146
Larger image 240Volt wiring
Tork WH series
Larger image: timer controls two 240Volt Loads
GE 15326 timer
Larger image
Terminals


All GE timers and manuals

GE 15328 timer/ 40 amp 240Volt// 24 hour/ same as Tork above except different override

40 amp/ indoor box
On-off override on front of box
Similar to Tork 1104 timer/ except override location
1/2"-3/4" Knockouts on sides, bottom, back of timer
Replacement parts are available
/ warranty support offered through Jasco
Buy 240 volt/ 24 hour
Buy 1 at Amazon
Buy 2 at Amazon
Buy replacement parts
Tork P47 trippers at Amazon
#201 208-277Volt clock motor
Replacement parts list
Resources:
GE Jasco 15328 timer manual
Large image of wiring
Tork WH series

Same as Tork WH and Tork 1104 timers shown above
Sylvania SA 315
Larger Image
Buttons larger
SA 315 at Amazon
Sylvania timers at Amazon

Sylvania timers and manuals

Sylvania SA315/ 7-day programmable/ 240Volt / 40 amp

Up to 7680 watts at 240Volt
CR2032 batteries.
Battery back up holds programming in power outage, metal outdoor box
'Lifetime warranty'/ most timers have standard 1 year warranty/ however most 240Volt electronic appliances are NOT protected from surge, and warranty might not cover surge damage+
No replacement parts are offered/ warranty support offered from Sylvania
Buy 240 volt/ 7 day:
SA307 240 volt indoor box
SA315 240 volt indoor/outdoor box

Resources
SA315          sell sheet            wiring
SA307                 sell sheet            wiring

Buy 120Volt models
SA300 / 120 Volt DP indoor At Amazon
SA310 120 Volt DP outdoor At Amazon
SA306 120 Volt SP outdoor At Amazon
More Sylvania timers and manuals
GE 15136 timer
All GE timers and manuals

GE 15136 7-day programmable/ 120-208-240V/ select voltage using dip switches

> 120 Volt or 240 Volt water heater timer/ change dip switch to select clock voltage
> DPST turns off both hot wires to 240V water heater
> Outdoor box
> 7 day programmable timer > 9 on-off settings per day > days of the week can be different > back-up battery > no reset after power outage > Indicator lights show operation
No replacement parts are available
/ warranty support offered through Jasco
Buy 120-208-240-277 volt/ 7 day:
GE 15136 outdoor metal box at Amazon
Resources:
GE 15132 manual
How to wire GE 15136
GE-15207
All GE timers and manuals

GE 15207 24 hour/ 120-208-240V/ select voltage using dip switches

> 120 Volt or 240 Volt water heater timer/ change dip switch to select clock voltage
> DPST turns off both hot wires to 240V water heater
Minimum 1/2 hour on-off > each day is same > rotate dial to set time > push dial segments down to set on-off functions
> Indicator lights show operation
> Reset time dial after power outage
No replacement parts are available/ warranty support offered through Jasco
Buy 120-208-240-277 volt/ 24 hour:
GE 15135 outdoor metal box at Amazon
Resources:
GE 15207 manual

How to wire GE indoor 15135

Woods water heater timer
See Larger

All Woods timers- manuals

Woods 59402/ DPST/ 40 amp/ 24 hour/ use jumpers to select 120-208-240V

Woods 59401/ SPST/ 40 amp/ 24 hour/ use jumpers to select 120-208-240V

120V or 277V or 208V-240V water heater and appliance
Jumper settings to change voltage
48 segments located around edge of timer dial/ 15 minute intervals
No replacement parts are available/ phone and warranty support available through CCI
Buy 120-208-240-277 volt/ 24 hour:
Woods 59402 DPST at Amazon
Buy 120-208-240-277 volt/ 24 hour:
Woods 59401 SPST at Amazon

Manuals/ resources
Woods 59401 and 59402 manual
59401 sell sheet
59402 sell sheet
Wiring for 59402 DPST same-similar to GM40 timer
How to set analog  timers

Typical 59401 SPST wiring
woods timer wiring
Typical 59402 DPST 240Volt water heater wiring
Woods timer wiring

More wiring options for DPST timers
Westek TM104
Westek TM104 DPST
Larger image

Westek TM104 / 240Volt / 24 hour/ SPDT/ choose indoor or outdoor metal box/ 40 amp max 5800 watt

40 amp capacity/
Pins located on dial, divide 24 hour/ 15 minute intervals
Repeats schedule each day
Permanent, on-off-timer override switch
No parts available/ unknown warranty support...probably shows on manual
American Tack & Hardware, Tel: (800) 777-0802

Buy 240 Volt/ 24 hour:
TM104 (T104D) /208-240-277V 40 amp/ DPST with 1 NC and 1 NO terminals/ at Amazon
TM104R with outdoor box at Amazon
TM21 240 Volt 25 amp (max 4500Watt) at Amazon
Buy 120 Volt/ 24 hour:
TM101 SPST 120Volt 30 amp at Amazon
TM103 DPST NO NC terminals 120 Volt clock motor/ 40 amp at Amazon
Resources
How to set analog timers

TM104R manual/ pdf
Possible wiring for TM104 (T104D)/ SPDT 208-240-277Volt/ 40 amp
TM104 wiring
Possible wiring for 120Volt TM101 SPST

Westek THWH21 timer
Larger image

Westek THWH21 / 240Volt / 24 hour/ SPST/ indoor metal box/ 25 amp max 4500 watt

25 amp capacity/ maximum 4500 watt
Pins located on dial, divide 24 hour/ 15 minute intervals
Repeats schedule each day
Permanent, on-off-timer override switch
No parts available/ unknown warranty support...probably shows on manual
American Tack & Hardware, Tel: (800) 777-0802

Buy 240 Volt/ 24 hour:
TM21 240Volt 25 amp (max 4500Watt) / indoor box/ at Amazon
TM104R 120Volt 40 amp / outdoor box)/ at Amazon
Resources:
How to set analog timers
THWH21 240Volt 40 amp timer manual/ pdf
Wiring for 240Volt TMWH21 240Volt 25 amp timer
TM104 wiring
120Volt timer
Westek TM101R timer


Westek TM101 / 120Volt / 24 hour/ SPST/ choose indoor or outdoor metal box/ 45 amp

For 120Volt water heaters

40 amp capacity
Pins located on dial, divide 24 hour/ 15 minute intervals
Repeats schedule each day
Permanent, on-off-timer override switch
No parts available/ unknown warranty support...probably shows on manual
American Tack & Hardware, Tel: (800) 777-0802

Buy 120 Volt/ 24 hour:
TM101R 120Volt 40 amp / outdoor box)/ at Amazon

TM101 120Volt 40 amp/ indoor box at Amazon

Resources:
How to set analog timers
TM101 120Volt 40 amp timer manual/ pdf
Wiring for 120Volt TM101 120 Volt 40 amp timer
TM104 wiring
GM40AV mechanical timer
GM40 electronic time switch

All Intermatic timers- manuals

Intermatic GM40 24-hour or 7-day models/ indoor-outdoor box/ 120-208-240V/ 40 amps

GM40 24-hour
GM40W 7-day
40 amp NO NC contacts/ 120V 208-240V 277 V/
Dip switches to select voltage
50,000 operations full load
Set dip switches before applying voltage
15 minute timer intervals on 24 hour timer/ 2-1/2 hour time intervals on 7-day
No replacement parts/ warranty and phone support at Intermatic.com
Buy 120-208-240-277 volt/ 24 hour:
GM 40       120-208-240-277Volt 24-hour at Amazon
GM40Q  24 hour battery back-up at Amazon
GM40W     120-208-240-277Volt 7-day skip-day at Amazon
GM40QW 7-day skip-a-day battery back up at Amazon
Manuals/ Resource:
GM40 instruction manual
Sell sheet with model numbers
Sell sheet 2
Wiring diagrams: How to wire GM40 timer
Wiring diagrams: How to wire GM40 timer/
GM40 water heater timer wiring
Woods timer wiring
See wiring for two 4500Watt water heaters
WHQ4 Water heater timer

All Intermatic timers- manuals

Intermatic WHQ 24-hour or 7-day models/ indoor-outdoor box/ 120-208-240V/ 40 amps

WHQ 9,600 watt water heater timer
120V 208-240V 277V
24 hour with 15 minute intervals
7-day Skip-a-day with 2 hour intervals
Nema 3R indoor-outdoor enclosure
Manual override on timer dial
No replacement parts/ warranty and phone support at Intermatic.com
Buy 120-208-240-277 volt/ 24 hour and 7-day:
WHQ4     120-208-240-277Volt 24-hour at Amazon
WHQ7     120-208-240-277Volt 7-day at Amazon

Manuals/ Resource:
WHQ series sell sheet
WHQ4 sell sheet
WHQ7 sell sheet
WHQ timer instruction manual
Wiring diagrams: How to wire WHQ timer/ Same as GM40 timer
WHQ water heater timer wiring
Woods timer wiring
See wiring for two 4500Watt water heaters
GM40AVE digital timer
GM40AVE digital
20 ON-OFF for 7-day or 24-Hour

All Intermatic timers- manuals

Intermatic GM40AVE 7-day/ 20-50 set points / 40 amp/ indoor-outdoor box/ 120-208-240-277V/ auto detect voltage

Automatic voltage detection 120-277V
Single channel FM1D20 digital timer/ 20 set points
Digital / 40 amp NO NC contacts
NEMA 3 indoor/outdoor enclosure
Automatically detects voltage
120V thru 277V automatic voltage detection
24 or 7-day
Battery back-up
1 channel timer: The independent relays can be wired for different loads, but both relays turn on-off at same time.
Buy 120-208-240-277 volt/ 24 hour and 7-day:
GM40AVE  120-208-240-277Volt at Amazon

Manuals/Resources:
GM40AVE manual
GM40AVE sell sheet
FM1D 20 setpoint programming
FM2D 50 setpoint programming
Wiring diagrams: How to wire GMAVE timer/ same as GM40 and WHQ series
Basic GM40AVE timer wiring
Woods timer wiring
See wiring for two 4500Watt water heaters
T7801BC
Large image of 120Volt T7401

All Intermatic timers- manuals

Intermatic heavy-duty 7-day mechanical timer/ minimum 3 1/2 hour on-off/ 40 amp

Heavy duty 7-day mechanical timers > more expensive than digital programmable shown at page top > mechanical timers are simple to set > each day of the week can be different > day skipper > some models have load carryover during power outage

T7400B series 120V models /208-277V models/ 4PST/ dry terminal
T7800B series 120V models /208-277V/ 2 NO 2 NC/ dry terminals

Buy 208-240-277 volt/ 7-day:
T7402BC indoor box/ power carry-over/ 208-240-277V/ 4PST/ at Amazon
T7402B indoor box/ 208-277Volt/ 4PST/ at Amazon

T7802B indoor box/ 208-277Volt/ DPDT 2NO 2NC/ at Amazon
Intermatic T7802B timer

Buy 120 volt/ 7-day:
T7401BC indoor box/ power carry-over/ 120V/ 4PST/ at Amazon
T7401B / indoor box/ 120 Volt/ 4PST/ at Amazon

T7801BC indoor box/ power carry-over/ 120V/ DPDT 2NO 2NC/ at Amazon
T7801B / indoor box/ 120 Volt/ DPDT 2NO 2NC// at Amazon

Repair parts
156T1978 trippers at Amazon
Replacement trippers at Amazon

131T68GA 125V motor with carryover
WG1600 125V motor at Amazon
WG1603 208-277V motor

Resources:
T7400-7800 Sell sheet with wiring
Sample manual

Electrical Tips for choosing box timer
1. Check load rating is 30 Amps
or more for safety. Most 240V water heaters are 3500, 4500 and 5500 Watts divided by 240 Volts = 14.5 Amps, 18.8 Amps, and 23 Amps.
2. In southern states, outdoor installation in direct sun will shorten life of timer.
3. For easy wiring, match clock voltage with water heater voltage 
4. Timers listed on this page are safe for 1 residential water heater/ but some of them are rated 9,000 watts and can control two water heaters (GM40, T104, CA3750). 
water heater timer in attic

Water heater timer in attic is not convenient

Tips for choosing & installing water heater timer
1. Re-setting timers after power outage is inconvenient, especially when located outdoors after thunderstorm.
2. Check timer has enough on-off periods per day or per week
3.It is difficult to reset timers located in remote locations requiring flashlight, for example in attic or cluttered utility area.
4. Put timer at eye-level

In-wall timer is more difficult to install, but gives easy access, and adds value to home.
Back to all timers
Install timer for easy access
water heater timer switches In-wall timer.
More difficult to install
Durable contactor is controlled by timer.
How to install
Water heater timer
See water heater timer installation
Handy resources:
Family chart for setting water heater timer
How to install electric meter on water heater
How much does it cost to operate water heater
How much does water heater timer save
I discovered that the timer caused me to schedule hot water use, and my overall usage declined.
Reducing consumption is the key to saving money with any type water heater
Off-peak water heater options
Troubleshoot electric water heater

Gas and electric water heatersBuy
Industrial electric at Amazon


Industrial supplies at Amazon

Industrial and scientific Amazon
Intermatic control centers Intermatic control centers:
+ manuals and parts


Including Z-wave
box timers Compare box timers

Compare ways to control Gas and Electric heaters
programmable timer Compare programmable timers

Control water heater with programmable wall timer
Countdown timers Compare countdown timers

Control water heater with countdown timer
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