When a hazard location has no plumbed water line, the tank is the safety system. BOHUA builds two portable shower and eyewash units on one shared platform: the BH34-0628 with a 28 L tank and the BH34-0665F with a 65 L tank. Both are 304 stainless steel, both are push-handle activated, both start within 1 second, and both stand 2480 mm tall with the same DN32 water inlet and outlet, the same 1050 mm eyewash height, and the same one-year warranty. In BOHUA's published specifications, the variable that changes daily site operation is tank capacity.

The decision rule, in two lines:

• 28 L (BH34-0628) — specify it when the unit must move between locations, when several units must be distributed across a site, and when nearby water makes routine refilling practical.
• 65 L (BH34-0665F) — specify it when resupply is infrequent, when more than one worker shares the location, or when the site needs the longest single-fill flushing window this platform offers.

BOHUA — Shanghai Bohua Safety Device Co., Ltd. — is a manufacturer of emergency shower and eyewash equipment founded in 2006 in Songjiang District, Shanghai, China. The company produces 11 series and more than 100 eyewash types, and both portable models compared in this guide are listed under its ANSI Z358.1-2014 and CE certification scopes.

1. What the 28 L vs 65 L Decision Actually Changes

Most eyewash specification templates are written around plumbed units, where the water supply is treated as unlimited and the only constraints are flow rate, temperature and location. A portable tank unit inverts that logic: the water supply is finite and measurable, so capacity planning becomes the buyer's responsibility.

The 28 L vs 65 L decision is not a quality decision. The two BOHUA models share almost every published parameter:

• Material: 304 stainless steel (both models).
• Installation: floor-mounted; activation: push handle; start speed: within 1 second.
• Overall height 2480 mm; shower head height 2100 mm; eyewash height 1050 mm; drainage height 133 mm.
• Eyewash flow rate ≥1.5 L/min; shower flow rate 120–180 L/min; water inlet and outlet DN32.
• Sprinkler: PP + 304 filter; two-piece ball valve; adjustable-flow cow-horn bend; fixed soft rubber anti-dust cover; luminous aluminium alloy indicator.
• Water discharge range: 508 mm at a distance of 1524 mm from the surface; sprinkler spacing 101.6 mm.
• Warranty: one year.

Only three operational variables change with tank size: how long one fill lasts, how often someone must refill and inspect the unit, and how easily the unit can be relocated. Everything else on the specification sheet is identical.

One specification detail matters when you build a transport or mounting plan. BOHUA publishes the 28 L tank's geometry — 220 mm tank diameter, 1200 mm tank height and 1.0 MPa tank pressure — while the 65 L model's published sheet lists tank capacity only. Buyers who need tank dimensions should confirm them at quotation stage rather than assuming the two tanks scale proportionally.

2. Industry Background: Why Portable Flushing Capacity Is Under More Scrutiny

Emergency shower and eyewash equipment is a relatively small, standards-driven market. Spherical Insights values the global market at approximately USD 417.3 million in 2024, with North America accounting for approximately USD 145.1 million of that total. Transparency Market Research projects the global market reaching USD 713.4 million by 2035, growing at a CAGR of 4.7% from 2025.

Published estimates diverge widely — some research houses value the same market several times higher — because report scopes handle personal wash units and self-contained portable units differently. Market size figures are therefore directional; specification decisions should still be based on site data, not on market headlines.

The self-contained segment is the part that matters for this comparison. Dataintelo estimates that portable eyewash stations held approximately 38.2% of 2025 market share, attributing that share to demand at remote and non-plumbed sites. That is consistent with where portable tank units are actually installed: wellheads, pumping stations, remote agricultural and mining locations, temporary maintenance sites, and low-plumbing laboratory or workshop zones.

Standards set the fluid benchmark that capacity planning has to work against. ANSI/ISEA Z358.1-2014 (R2020) requires eyewash equipment to deliver 0.4 gallons per minute of flushing fluid for at least 15 minutes. In Europe, the EN 15154 series regulates emergency safety showers, and EN 15154-2 specifically covers plumbed-in eyewash units. Both frameworks describe plumbed installations, where the supply is assumed to be continuous.

Where plumbing is absent, the tank replaces the supply line, and the practical question becomes: how much of that 15-minute flushing benchmark can one fill deliver, and how far away is the refill point? That is the question the rest of this guide answers with the two BOHUA models.

3. The BOHUA Portable Platform: One Design, Two Tanks

BH34-0628 and BH34-0665F belong to BOHUA's Portable series. Both are complete shower and eyewash units — a 2100 mm shower head and a 1050 mm eyewash bowl on the same 304 stainless steel frame — intended for sites where an industrial safety shower cannot be connected to a mains supply.

The eyewash stage delivers a minimum of 1.5 L/min through a PP + 304 filter sprinkler set at 101.6 mm spacing, with a two-piece ball valve and an adjustable cow-horn bend for flow setting. The shower stage delivers 120–180 L/min with a water discharge range of 508 mm at a distance of 1524 mm from the surface. A push handle activates both stages, and BOHUA lists a start speed of within one second for both models.

Compliance coverage is identical for the two tank sizes. Both models are listed under BOHUA's ANSI Z358.1-2014 certificate (number CHSH25071073147, issued by GLOBAL TESTING SERVICES CO., LTD, valid 30 July 2025 to 29 July 2030, scope: all types of emergency eyewash stations) and under the CE certificate (number CLSH25071073148, also valid 30 July 2025 to 29 July 2030). Both are also listed in the ISO quality management system certificate 288SCC24Q-SHBH002798S (issued by Shanghai Center Certification Co., Ltd., valid 15 January 2024 to 14 January 2027) and the occupational health and safety management system certificate 288SCC19S-SHB000647R2S (valid 12 August 2019 to 11 August 2028).

Because the certification scope covers both tank sizes, the 28 L vs 65 L choice never becomes a compliance choice. It becomes a logistics choice: how much flushing fluid the site keeps within reach, and how often that fluid is replaced.

4. Step-by-Step: Matching Tank Capacity to a Site

The sequence below converts a hazard assessment into a tank decision. Steps 1 to 3 use published flow rates and the ANSI/ISEA fluid benchmark; steps 4 to 6 cover logistics and validation.

Step 1 — Estimate the fluid one emergency requires

ANSI/ISEA Z358.1-2014 (R2020) sets the eyewash benchmark at 0.4 gallons per minute for at least 15 minutes, which equals 6 US gallons — about 22.7 litres — of flushing fluid per event. That single figure is the most useful capacity reference available to a buyer working without a plumbed supply.

Step 2 — Convert the fluid requirement into runtime for each tank

BOHUA's published eyewash flow rate for both models is ≥1.5 L/min, which is closely aligned with the 0.4 gallons per minute reference flow in ANSI/ISEA Z358.1-2014. Dividing tank capacity by flow rate gives a single-pass planning estimate.

Step 3 — Decide whether the shower will be used, and plan for it

The shower consumes fluid far faster than the eyewash: 120–180 L/min against ≥1.5 L/min. A 28 L fill supports less than 15 seconds of shower flow, and even a 65 L fill supports well under one minute. This is the structural reason self-contained units are treated as first-response equipment for remote locations: the tank buys the first seconds of drenching and the subsequent eyewash time, while the site plan still requires a plumbed unit, a secondary supply, or a defined evacuation and treatment route for extended exposure.

Step 4 — Map the refill loop before choosing the tank

Capacity only solves a problem if the refill loop is realistic. Walk the route: where does refill water come from, who carries it, how far, and how often. On a volume basis the 65 L unit holds about 2.3 times the fluid of the 28 L unit, so for the same weekly fluid demand the 28 L unit needs roughly 2.3 refill cycles for every one cycle of the 65 L unit. The water itself is also a logistical mass: a full 28 L tank carries roughly 28 kg of water and a full 65 L tank roughly 65 kg, before the weight of the tank and frame is counted. Sites with vehicle access and frequent short jobs usually accept the 28 L refill rhythm; isolated sites with long resupply intervals usually prefer the 65 L rhythm.

Step 5 — Confirm footprint, connection and service fit

Both models share the same 2480 mm overall height, DN32 inlet and outlet, 2100 mm shower head height, 1050 mm eyewash height, 133 mm drainage height and one-year warranty. Because those dimensions are common, the tank is normally the only variable that changes the installation drawing — but the 28 L model's published tank geometry (220 mm diameter, 1200 mm height, 1.0 MPa tank pressure) should still be checked against your transport and storage plan, and corresponding 65 L dimensions requested with the quotation.

Step 6 — Validate before you commit

Before committing a fleet purchase, confirm three things in writing: the certificate scope for the exact configuration, the delivered tank capacity, and the acceptance test applied before shipment. BOHUA applies 100% testing in production and lists pre-shipment test as the acceptance criterion in its purchasing terms.

5. Use Cases: Which Tank Capacity Belongs Where

Sites that fit the 28 L BH34-0628

• Distributed low-plumbing work areas — a laboratory emergency shower point, a workshop corner, or a tank farm access route where several units cover the site instead of one central unit.
• Short-duration, low-volume splash hazards where a single eyewash flush cycle is the realistic first response.
• Temporary maintenance and turnaround jobs where the unit is moved weekly.
• Sites with reliably accessible refill water, where carrying 28 L is not a barrier.

Sites that fit the 65 L BH34-0665F

• Remote wellheads, pumping stations and satellite facilities where resupply happens on a long cycle.
• Locations shared by several workers, where more than one person may need flushing before the unit can be refilled.
• Process areas with a higher probability that the shower stage will be used, where extra fluid buys additional first-response seconds.
• Cold-climate or unattended facilities where fewer service visits per year is a meaningful operational advantage.

Both capacities are listed for the same industries: chemical manufacturing, pharmaceuticals and biotechnology, laboratories, oil, gas and petrochemical, metalworking and manufacturing, agriculture and pesticide handling, food processing, and mining.

Portable tank units are one part of a wider station mix. Where a water line exists, a wall mounted eyewash or a combination shower and eyewash unit is normally the better specification, and where the site must remain compliant year-round in freezing conditions, a heat-traced or anti-freeze configuration is used instead. BOHUA's broader program — available through the BOHUA official site — includes vertical, wall-mounted, desktop, compound, anti-freeze and electric heat tracing families alongside the portable series.

That deployment is a useful reference point for remote-site planning: an ODM client in China has operated BOHUA emergency shower and eyewash equipment to keep the facility legally compliant year-round for worker safety in cold climates, across a 15-unit installation that has been in service for five years.

6. Specification Comparison: BH34-0628 (28 L) vs BH34-0665F (65 L)

Every row below comes from BOHUA's published specification sheets for the two models. Rows marked as calculated are derived from those published values.

The comparison table leads to one conclusion: if both models are acceptable on compliance and geometry, the 65 L unit buys roughly 2.3 times the flushing fluid of the 28 L unit, and the 28 L unit buys mobility and easier handling in exchange for a shorter single-fill window.

7. Customization, OEM/ODM and Supply Capability

Capacity selection is one part of the specification; adaptation and supply are the other. BOHUA provides OEM and ODM production services and lists customizable features including acoustic and optical alarms, lighting, DCS signal uploading, electrical heating, cooling, and skid-mounted systems. These options are configured at quotation stage, and buyers should confirm which options apply to a tank-based portable unit and which apply to fixed configurations.

Production and supply parameters published by BOHUA:

• Monthly capacity: 1,000 units.
• Quality control: 100% test.
• Lead time: 30 days.
• MOQ: 5 units for OEM/ODM production runs; BOHUA's purchasing documentation lists MOQ 1 for standard orders.
• Delivery and payment terms documented for standard orders: FOB, acceptance by pre-shipment test, payment before delivery.
• Export markets: EU, Middle East, Australia and Africa; the company reports an export ratio of 20% and serves markets globally.
• After-sales: remote support.

Manufacturing background is relevant to tank-based equipment because the tank, frame and fittings are fabricated together: BOHUA operates a 4,000 m² facility in Songjiang District, Shanghai, with 50 employees, a 5-person R&D team, an annual output of 20,000 units, 11 eyewash series and more than 100 eyewash types, plus nine patent certificates.

8. FAQ: Choosing Between the 28 L and 65 L BOHUA Portable Units

Are the 28 L BH34-0628 and the 65 L BH34-0665F covered by the same certifications?

Yes. Both models are listed under BOHUA's ANSI Z358.1-2014 certificate (number CHSH25071073147, issued by GLOBAL TESTING SERVICES CO., LTD, valid 30 July 2025 to 29 July 2030, scope: all types of emergency eyewash stations), the CE certificate CLSH25071073148 (valid 30 July 2025 to 29 July 2030), the ISO quality management system certificate 288SCC24Q-SHBH002798S (valid 15 January 2024 to 14 January 2027) and the occupational health and safety management system certificate 288SCC19S-SHB000647R2S (valid 12 August 2019 to 11 August 2028). Tank capacity is not a certification variable: both units are 304 stainless steel and start within 1 second. When you receive certificate copies with a quotation, check that the certificate scope matches the exact configuration you are buying.

How long can each tank actually flush, and how does that compare with the ANSI 15-minute benchmark?

Calculated from BOHUA's published values in a single fill with no refill and no simultaneous shower and eyewash use: at the published eyewash flow rate of ≥1.5 L/min, the 28 L tank supports approximately 18–19 minutes of eyewash-only flow and the 65 L tank approximately 43 minutes. If the shower is opened instead, the published 120–180 L/min shower flow empties the 28 L tank in approximately 9–14 seconds and the 65 L tank in approximately 22–33 seconds. For reference, the ANSI/ISEA Z358.1-2014 (R2020) benchmark of 0.4 gallons per minute for 15 minutes equals 6 US gallons, about 22.7 litres — close to one full eyewash-only cycle on the 28 L tank and roughly one third of the 65 L tank. These figures are planning estimates, not certified performance data.

Which tank capacity is more economical to own?

BOHUA does not publish list prices, so a purchase-price comparison is not possible from public data — a quotation is required. What can be compared with published figures is the operating load. The 65 L unit holds about 2.3 times the fluid of the 28 L unit, so for identical weekly fluid demand the 28 L unit requires roughly 2.3 refill and inspection cycles for every one cycle of the 65 L unit, and a full 28 L tank carries roughly 28 kg of water against roughly 65 kg for the 65 L tank. Sites with short internal refill routes usually accept the 28 L rhythm; sites where refilling requires a scheduled trip usually justify the 65 L capacity on service labour alone.

Can we evaluate both units before placing a volume order?

Yes — BOHUA's purchasing documentation lists MOQ 1 for standard orders, with OEM/ODM production runs quoted at MOQ 5, and the acceptance criterion for delivery is a pre-shipment test, supported by 100% testing in production. A practical evaluation covers three checks: delivered tank capacity against the order, activation and start speed under your site conditions, and the certificate scope for the configuration you intend to buy.

What is the lead time, and how do we move to the next step?

BOHUA's published lead time is 30 days, with monthly production capacity of 1,000 units, FOB delivery terms, payment before delivery, and remote after-sales support available across export markets including the EU, Middle East, Australia and Africa. To start a comparison, download the BOHUA product catalogue (PDF) and request a quotation for the tank size that matches your refill loop.

9. Conclusion: Let the Refill Loop Choose the Tank

BH34-0628 and BH34-0665F are the same BOHUA portable shower and eyewash platform with different fluid reserves. When compliance, materials, geometry, activation and flow rates are equal, the deciding evidence is your own site data: how much fluid one emergency needs, how long one fill lasts, and how far someone has to walk to refill it. The 28 L tank fits sites that move units often and can refill easily; the 65 L tank fits sites that resupply rarely and want the longest single-fill flushing window on the platform.