Info Technical Discussion | HOTDIVE Diving Equipment Development

[iain/hsm]

HOTDIVE S1 FIRST STAGE REGULATOR
I’d like to talk about one of the first stage regulator from our product – the Hotdive S1. The biggest strengths of this regulator are its simple structure, reliability, and extremely low maintenance cost. It uses a classic unbalanced piston design with a downstream valve, which makes it very stable and especially suitable for frequent use. In warm and moderate water conditions, its performance remains steady without issues. Because of this “workhorse” durability, the S1 is often chosen by dive centers and training schools as a standard rental unit – it meets the safety needs of beginners while greatly reducing the maintenance burden for dive shops.

What really makes the S1 durable is the use of marine-grade SUS304 stainless steel. Compared with most common brass regulators on the market, stainless steel has higher strength and superior resistance to corrosion. Brass regulators usually rely on chrome plating for protection, and once the plating wears off, the underlying material is easily attacked by seawater, leading to faster degradation and potential safety risks. Stainless steel, on the other hand, has inherent corrosion resistance. Even in high-salinity marine environments, it maintains stability and durability over long-term use, which is why many professional divers and dive shops prefer stainless steel regulators.

From a technical perspective, the S1 supports both YOKE and DIN connectors. It’s built with SUS304 stainless steel and stainless steel springs. The weight is about 640g for YOKE and 511g for DIN, making it compact and lightweight for carrying. It comes with 1 high-pressure port (7/16" 20W UNF) and 4 low-pressure ports (3/8" 24W UNF-2B). The intermediate pressure is 123–138 PSI (8.5–9.5 Bar), with air supply rated at 232 Bar (3364 PSI) for YOKE and 300 Bar (4351 PSI) for DIN. The unit has CE and EN250 certification. Overall the configuration is very standard, reliable, and practical.

In terms of application, the S1 can be considered a true workhorse regulator. It’s especially well-suited for dive shop rentals, training schools, and even personal recreational diving. For beginners, the S1 provides stable air delivery, is straightforward to use, and requires minimal upkeep, making it one of the most common regulators new divers first experience. For recreational divers, while it’s not designed to be a high-end flagship model, its reliability and consistency make it a very reassuring choice for vacations, daily dives, or training sessions.

In my view, the S1 is not built for extreme or technical diving, but with its durability, low cost, and stability, it has become a “classic” in dive centers and schools. In many situations, what divers really need is not the most complex design, but a partner that works reliably every time.

I’d love to hear your thoughts: when choosing a first stage regulator, do you prefer the simplicity and reliability of an unbalanced piston, or the higher performance of balanced piston/diaphragm designs? In your opinion, especially in rental and training environments, is simplicity and durability more important, or is high-end performance the priority? Has anyone here used a similar unbalanced piston regulator, and what has your long-term experience been like in terms of stability, corrosion resistance, and maintenance cycles? Looking forward to your feedback and discussion.

I note you have not made any reply regarding the CE certification aspects of your products hence why I copy your statement above fully to avoid any subsequent removal of information given in your post number 19 and would urge members to copy information given by this company as we have web sites removed clean already. Thank you for your attention.

 

[iain/hsm]

HOTDIVE S1 FIRST STAGE REGULATOR
I’d like to talk about one of the first stage regulator from our product – the Hotdive S1. It uses a classic unbalanced piston design with a downstream valve,

This statement above of using a classic piston design clearly suggest its a Chinese copy

Because of this “workhorse” durability, the S1 is often chosen by dive centers and training schools as a standard rental unit – it meets the safety needs of beginners while greatly reducing the maintenance burden for dive shops.

This illustrates a clear risk to both dive schools and instructors as the liability insurance aspects in the event of an accident resulting in a death falls on the importer.

Further as the end users individuals instructor and dive schools self import these products under a Drop Ship procedure as suggested by both Hot Dive and Scuba Gadgets et al it is the importer that will be liable not the shipper in China. This is clearly deceitful.

From a technical perspective, the S1 supports both YOKE and DIN connectors...... The unit has CE and EN250 certification. Overall the configuration is very standard, reliable, and practical.

Maybe the smoking gun but there you have it in a clear statement in your post 19 that the unit having both the required CE and EN250

I note on later posts you have removed the critical term EN250 and replaced it with CE which I am stating stands for China Export but once again we are asking for evidence.

In my view, the S1 is not built for extreme or technical diving, but with its durability, low cost, and stability, it has become a “classic” in dive centers and schools. I

And we are back to said dive centres and schools taking full liability for this product while the shipper bares no liability whatsoever

I’d love to hear your thoughts: ......especially in rental and training environments.

I believe you just did. Please reply if indeed you are still in employment with Hotdive. Thanks.

 

[iain/hsm]

Today I'd like to share some insights about the Hotdive S2 EVO balanced piston first stage. As a mid-range regulator, it features several noteworthy design and functional details.

The S2 EVO utilises a balanced piston design with a main body constructed from SUS 316 stainless steel. The internal configuration varies by connection type: the Yoke version incorporates a stainless steel disc filter, while the DIN version employs a conical sintered bronze filter.

Maintenance convenience has been considered in this first stage's design. The high-pressure seat made from PFA material offers good durability, and routine maintenance typically requires only ultrasonic cleaning. The swivel turret design facilitates hose management and helps prevent tangling.

Regarding specifications, the S2 EVO is available in both YOKE and DIN connection options. The Yoke version weighs 595g, while the DIN version weighs 522g. It features 5 low-pressure ports and 2 high-pressure ports, with intermediate pressure output stabilised at 130-145 PSI (9-10 Bar). The air supply supports 232 Bar (3364 PSI) for Yoke and 300 Bar (4351 PSI) for DIN configurations. The product is CE certified.

It should be noted that the S2 EVO is designed for conventional water temperature environments and is not suitable for ice diving conditions. The standard version supports compressed air only; for nitrox applications, a specially treated O2 version must be selected.

In terms of user experience, the weight and dimensions of this first stage make it suitable for travel use. The stainless steel construction provides good durability, making it well-suited for recreational diving environments where it demonstrates solid performance.

Overall, the S2 EVO represents a mid-range regulator that achieves a good balance between performance and maintenance convenience, making it appropriate for most recreational diving scenarios.
View attachment 916019

Again I copy this post of yours in its entirety for reference.

 

[iain/hsm]

Today I'd like to share some insights about the Hotdive S2. The product is CE certified.

It should be noted that the S2 EVO is designed for conventional water temperature environments and is not suitable for ice diving conditions.

Ok now to your post number 52 in the thread.
I note you have dropped the EN part and simply state that the product is CE certified

But critically this time no mention of EN250 or the independent notified body who is required to achieve certification. Therefore can we all assume it's just cheap copy of someone else's design with an in house CE China Export label. In a word its a self tested product to your own internal in house standards.
With no regard or respect that you're putting your international customers at risk and misleading them into trusting with the assumption that this product is properly CE certified. Again please comment we have a lot more to discuss.

 

[lizardland]

Bu this time no mention of EN250 or the independent notified body. Therefore can we assume its just cheap shot CE China Export self tested product to your own internal in house standards.

Tut-tut, it's been tested by "professional divers". What more do you want? All the survivors give glowing testimonials.

Surely if I copy a design from somewhere that had it tested then I get to copy the test certificate as well?

 

[lexvil]

I appreciate new things and ideas, materials and care not for certifications which really prove nothing.

 

[HotDive(Hide In Ocean)]

Ok now to your post number 52 in the thread.
I note you have dropped the EN part and simply state that the product is CE certified

But critically this time no mention of EN250 or the independent notified body who is required to achieve certification. Therefore can we all assume it's just cheap copy of someone else's design with an in house CE China Export label. In a word its a self tested product to your own internal in house standards.
With no regard or respect that you're putting your international customers at risk and misleading them into trusting with the assumption that this product is properly CE certified. Again please comment we have a lot more to discuss.

Our products hold multiple testing certifications, which are not limited to environmental standards like CE and EN250. Furthermore, our company is continuously collaborating with various third-party agencies to expand the range of testing certifications. Regarding #52, I did not delete it — I simply forgot to type up EN250. Thank you for your ongoing attention.

 

[HotDive(Hide In Ocean)]

Every great beginning is met with its share of obstacles and challenges. Thank you for your continued interest in us — you will bear witness to our constant progress and future success. If you are also a professional in the diving industry, we would be very pleased to engage in in-depth conversations with you.

 

[HotDive(Hide In Ocean)]

I swear stuff like this only exists because those muppets on Youtube who do unboxing videos single-handedly keep the companies in business.

If you go to the effort of putting on an anti-drowning bracelet because you think you might be doing something risky around water but not an actual lifejacket or buoyancy aid then you really do deserve to drown.

It reminds me of the video of George Irvine unrolling a body bag as part of the DIR equipment update.

HOTDIVE is dedicated to the research, development, and innovation of diving equipment. By incorporating advanced materials and innovative designs, we aim to drive progress within the industry. With significant investments in cutting-edge technologies and high-end facilities, we continuously enhance our production efficiency — enabling users to acquire top-tier diving gear at highly accessible prices. Through these efforts, we strive to make diving simpler and more inviting, inspiring more people to explore and fall in love with this captivating sport.

 

[lizardland]

Our products hold multiple testing certifications, which are not limited to environmental standards like CE and EN250. Furthermore, our company is continuously collaborating with various third-party agencies to expand the range of testing certifications. Regarding #52, I did not delete it — I simply forgot to type up EN250. Thank you for your ongoing attention.

Is any of that certification available? I've had a look on your website and can't see anything.

Is it tested to any kind of recognised standard that indicates at least a bare minimum level of safety and performance?