Worcester Greenstar 9/12/15/18/21/24/25/30 i Main Heat Exchanger 8716117040

Worcester Greenstar 9/12/15/18/21/24/25/30 i Main Heat Exchanger 8716117040

Marsoni

M251S

$199.50

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

Worcester Greenstar 9/12/15/18/21/24/25/30 i Main Heat Exchanger 8716117040This Greenstar Main Heat Exchanger from Worcester is designed for select models of 9 12 15 18 21 24 25 30i boilers. It is constructed from the highest grade material and is designed for long lasting, impressive performance. It is rigorously tested to protect against corrosion and to ensure its efficiency and safety.

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It's true to size. I have a 42" chest and typically wear a large. I ordered large and it fits. Grab these while you can as most of these mock neck t shirts are a cotton poly blend. These are 98% cotton. This is important because although the cotton/poly blends dry quicker, they are uncomfortably warm if it gets above 70 F. I have purchased other mock turtlenecks and had my local dry cleaners convert them from long sleeves to short, but they are slightly heavier weight than these. I do wish that they made these in a dark green or military green color.

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Reviewed in the United States on March 26, 2026