ESi Mechanical Dual Cylinder Thermostat

Marsoni

M251S

$25.00

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

ESi Mechanical Dual Cylinder ThermostatESi Mechanical Dual Cylinder Thermostat precision temperature control for dual cylinder heating systems. This robust mechanical thermostat maintains consistent water temperature across both cylinders, ensuring reliable performance in demanding boiler applications. Designed for compatibility with ESi boiler models, it features a durable mechanical sensing element and straightforward adjustment mechanism. Ideal for systems requiring independent or

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We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
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For those of you with the 135 hp mercury that was branded as the "Sea Ray 135" and paint matched to the boat (i.e. Seville's and some others) this is the 147 degree thermostat for that motor. My Seville is an '88 and It's difficult to cross reference the serial numbers on those motors when searching for parts. Only buy Quicksilver parts for these motors. Happy to find them on Amazon because Boats.net as an example, is not clear on what you're getting.

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Reviewed in the United States on August 3, 2024

Verified Purchase

Carlton Earley

Cuba, US

★★★★★ 5

fixed issue

stopped the overheat issue on my outboard!!!

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Reviewed in the United States on August 6, 2025

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Brett W.

Fort Morgan, US

★★★★★ 5

Carries all the current I want. Super flexible, great price

Size: 8 AWG 3 ft per color, Color: Red and Black

Very nice high quality. Somebody tried to tell me this was aluminum strands. But after test sanding an exposed end, I could see copper color. I believe the confusion is they are individually tinned strands? 🤷 Just sayin...

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Reviewed in the United States on June 28, 2025

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Noce

Port Orchard, US

★★★★★ 5

good quality.

Size: 8 AWG 3 ft per color, Color: Red and Black

The wire worked very well for my project.

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Reviewed in the United States on April 22, 2024

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Vlad Gruetz (YT)

Birmingham, US

★★★★★ 5

Well worth the money

Size: 8 AWG 3 ft per color, Color: Red and Black, Size: 8 AWG 3 ft per color, Color: Red and Black

Much easier to use over trying to put the hard case extension wires in my solar controllers.. very well made. Now I can feel confident I got the wires in properly.

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Reviewed in the United States on March 18, 2019