Reviewer:
David Sutherland from Cambridge, ON Canada
These things burn-out like lightbulbs!...every time you start-up the boiler after draining it for some other repair or improvement. Lochinvar should have these supplied by NGK/NTK who makes perfect automotive temperature (and other) sensors. If you don't have these on-hand, you could be waiting for shipping, with no furnace, in the middle of winter!
parts4heating perfect...part Chinese? 
