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Wood-Fired Boilers - What's the difference? Steel grades explained!

When discussing stainless steel, you may be familiar with grades such as 304 and 316. These grades denote the composition of the steel and determine its properties, particularly its resistance to corrosion.


304 Stainless Steel Heater

Our Eco Tubs feature the sturdy 304 stainless steel heater as a minimum, consisting of 18% chromium and 8% nickel. This choice not only makes it the most cost-effective corrosion-resistant material but also offers endless production possibilities. Resistant to oxidation and capable of withstanding even the most extreme temperatures. Furthermore, its resistance to organic chemicals makes it an ideal choice for those seeking a holistic and eco-friendly hot tub experience.

316 Stainless Steel Heater

For those seeking additional corrosion resistance, we provide the option to upgrade to our premium 316 stainless steel heater. (Note: Grade 316 is provided as standard on our Kingham & Moreton Eco Tubs.) With a composition of 16% chromium, 10% nickel, and 2% molybdenum, this heater boasts enhanced corrosion resistance, owing to the molybdenum content. Not only does our 316 stainless steel heater excel in resisting chlorine and oxidation, but it also thrives in acidic environments, making it a suitable choice for hot tubs subjected to chemical treatments.


It's worth noting that while some companies may offer cheaper grades of stainless steel (such as grade 430) to cut costs, these sub-standard materials may not withstand the rigours of hot tub use, particularly when exposed to chemicals.


At Cotswold Eco Tubs, we prioritise quality over cost-cutting measures, ensuring that our hot tub boilers are built to withstand the test of time and provide years of enjoyment.

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