Transformer, Pentair, Max-E-Therm/MasterTemp, 115v/230v, 24v

Transformer, Pentair, Max-E-Therm/MasterTemp, 115v/230v, 24v

Marsoni

M251S

$72.00

Get it in 3 business days with 1 day shipping. Friday, May 29

Transformer, Pentair, Max-E-Therm/MasterTemp, 115v/230v, 24vReplace your faulty transformer with this genuine Pentair 42001 0057S Transformer, compatible with Max E Therm and MasterTemp heaters requiring 115v 230v to 24v power.

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Your Transformer, Pentair, Max-E-Therm/MasterTemp, 115v/230v, 24v orders ship within 1-2 business days.

Delivery Options:

Standard: 3-7 business days
Fast: 2-3 business days
Express: 1-2 business days

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Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
To process your return/exchange, please contact us at [email protected]
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Reviewed in the United States on May 26, 2026