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Takes Advantage of Off-Peak Utility Rates and Runs Your Hot Water Heater Only When Needed
250V SPST 25A Indoor Heavy Duty Water Heater Timer
Westek THWH21 250 Volt SPST 25 AMP Hardwire Indoor Heavy Duty Water Heater Timer Switch
Westek THWH21 250 Volt SPST 25 AMP Hardwire Indoor Heavy Duty Water Heater Timer Switch
Item# 5405
Price: Normally $69.99 
Hot Deal $37.95
Free shipping on orders over $175 - See Details


  • Switch ratings are: 250V, SPST, and 25AMP
  • 48 On / 48 Off settings
  • 15 minute increments for maximum programming flexibility
  • Withstands temperature extremes
  • Plastic housing

Essential Info

The Westek Indoor Heavy Duty Water Heater Timer takes advantage of off-peak utility rates and your hot water heater runs only when needed. The sturdy plastic housing is lockable to prevent tampering. It has 48 On and 48 Off settings , requires no tools to be programmed, and the non-removable pins cannot be lost.
Important notes:
Only merchandise credit for defective items returned within 30 days of purchase. No other returns allowed on this item.
Manufacturer contact information: American Tack & Hardware, Tel: (800) 777-0802


2 Ratings
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Average Customer Rating
(2 customer ratings)
Share your thoughts with other customers
Emporium28 -- florence, SC   1/19/2011
I was very happy with the very prompt response to my order request, the sales force is topnotch. The THWH21 is not one of your best items. The instruction for its installation and operation are poor, the size wire I needed to use AWG# 10 wire, it was very difficult to install. Once I wired it the unit did not work. Could not find the manufacture for a replacement. Smarthome needs to really reconsider selling this product. emporium28 - Florence, SC
RICHARD -- columbus, GA   12/28/2010
I w3as very happy with the very prompt response to my order request. However, I would suggest that you change vendors with respect to this particular item. It was very difficult to install and the instruction for its installation and operation were not only very poor they were literally microscopic. I needed a magnifying glass just to read the English instructions. The instructions in other languages were, for some reason, much larger. To install the unit I needed to remove the mechanism which is not unusual, but the mounting screws were put in so tightly that one of the mounting screws stripped out before I could remove it. Mounting the unit on the wall was easy and straight forward, but wiring it in was almost impossible. The manufacturer allowed almost no room for the wires, less than an inch, and even less where the connections needed to be made. Using a wire size any larger than # 14 would have made installation impossible. I did manage to complete the installation, but I would never recommend the Westek to anyone. Another interesting feature that lowers my opinion of Westek products is that the housing itself was so thin that I thought that I might break the housing while I was trying to make the required connections. I seriously wonder if Smarthome really researches the best products for their sales line.
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