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Polaris ignitors

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I'm using a Polaris water heater for radiant heat. Like many, I suffer from Frequent Ignitor Failure, so I want to minimize the cost of ignitors.

Does anyone know if I can replace the expensive (and hard-ton-find) Norton 271Q ignitor with the cheaper (and readily available) Norton 271A?

(I know I would have to rework the mounting bracket, since the 271A ceramic base is thicker)
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