Quote:
Between $20 an $25 now plus shipping.
http://www.google.com/search?q=wafe...vns&ei=ewNJTeG8K4-u8AbHwrjfDg&ved=0CAkQuw0oAA
Yeah they have gone up at retail, I see. Thanks.
They are still a good value, when you consider their reliability and "plug and play" use. Their parts can also be replaced as separate pieces, if needed, for well under $15.
I have never seen the switch portion go bad, and switches of that sort are usually rated at a million cycles or more. The gas-filled wafer can go bad over time, but can be replaced for $7.
They were in use for decades, long before most of us were born. They have a long and proven track record of success. THAT is both comforting and a good value at the price.
You could also have an incubator up and running with these - before you figure out that the water heater thermostat is a pain in the neck.
Then there are these - for $14.95:
http://cgi.ebay.com/Incubator-Therm...800?pt=LH_DefaultDomain_0&hash=item35aadf8830
These strike me as very reliable and even less trouble, since they are nothing more than bi-metallic contacts.
There are even electronic thermostats from Russia, now. With a bit of shopping they can be had for around $30.
With all of these choices, I remain baffled that people keep trying the water heater varieties. I also find it disturbing that "enterprising" people are hawking cheap water heater thermostats on
ebay as 'incubator ready'. If you backed their flat backside with a water vessel of some kind, in the manner they were intended to be utilized, they may do alright. But, for controlling the chambers air mass, alone, I continue to think they are more trouble than they are worth.
Nonetheless, if you are determined to make the cheapest possible items work with the maximum amount of experimentation, effort and bother, then the water heater thermo's would be just the ticket. You are very likely to get your moneys worth, in that case.
But people abandoned them as impractical, well before the current crop of experimenters came along. That hasn't really changed, even if we persist in trying.