27° All 304 Stainless Steel Integrated 100L Non-Pressure Solar Water Heater

A 27° all 304 stainless steel integrated 100L non-pressure solar water heater is the ideal entry-point SKU for distributors, importers, and brand owners targeting warm-climate residential markets. The system combines a food-grade SUS304 stainless steel inner and outer tank, ten 58×1800 mm evacuated vacuum tubes, 50 mm polyurethane insulation, and a 27° galvanized or stainless steel bracket into one compact thermosyphon unit that requires no pump, no controller, and no electricity for operation.

This guide consolidates verified manufacturer specifications, the 27° tilt rationale, export terms, and a buyer FAQ to help you source with confidence.

Why 27° Tilt Angle Matters

The 27° bracket angle is not arbitrary. It is the optimal tilt for solar water heaters installed in:

• Low-latitude regions (latitude 15°–30° N/S)

• Mexico, Central America, the Caribbean, and northern South America

• Southeast Asia, India, and the Middle East

• Southern China, Africa's equatorial belt, and coastal regions

At 27°, the collector surface captures near-maximum annual solar irradiation while shedding rain and dust naturally. Chinese manufacturers offer 27° as a standard bracket angle alongside 18°/20°/38°/45° options, with customized angles available on request.

The 27° configuration is particularly well-suited for non-pressure thermosyphon systems because the steeper angle promotes stronger natural circulation between the vacuum tubes and the tank.

How the Integrated Non-Pressure System Works

The operation follows the natural thermosyphon principle:

1. Ten 58×1800 mm borosilicate glass vacuum tubes with three-target CU/SS/ALN coating absorb sunlight and convert it to heat.

2. Cold water from the bottom of the tank flows down into the tubes; as it heats, it becomes less dense and rises back into the tank.

3. This continuous natural circulation requires no pump, no controller, and no electrical input.

4. The SUS304 stainless steel tank with 50 mm polyurethane insulation retains heat for up to 72 hours.

5. Hot water exits under gravity pressure, determined by the height difference between tank and outlet.

Critical installation rule: the tank must be installed above the collectors for thermosyphon to occur. Non-pressure systems rely on gravity pressure, so the tank should be positioned on the roof or at least 3–4 meters higher than the hot water tap.

All 304 Stainless Steel: What "All" Means

When manufacturers specify "all 304 stainless steel," they refer to:

• Inner tank:​ SUS304-2B food-grade stainless steel, 0.31–0.5 mm thickness

• Outer tank:​ SUS304 stainless steel, 0.31–0.4 mm thickness (optional; many economical units use SUS201 or color-coated galvanized steel outer tank)

• Bracket:​ SUS201 or SUS304 stainless steel, 1.2–1.5 mm, with 27° angle

• Fasteners:​ SUS304 stainless steel bolts and nuts

For a true fully stainless steel unit (inner + outer + bracket all SUS304), expect pricing at the higher end of the range. The SUS304 inner tank is non-negotiable for food-grade water safety; the outer tank and bracket can be specified as SUS304, SUS201, or galvanized steel depending on your corrosion-resistance requirements and budget.

SUS304 contains 18%–20% chromium and 8%–10.5% nickel, forming a dense passive oxide film that prevents corrosion, ensures no rust or toxicity, and delivers 10–15 years of service life under normal water conditions.

Standard 100L Technical Specifications

Based on verified manufacturer data from Seven SS Stars, Zonyi Solar, Babysun, and Vision Solar:

FOB Price Reference

Based on verified manufacturer quotations:

• 100L non-pressure compact unit:​ FOB US$75–300/set from Shanghai or Ningbo

• All-stainless-steel 100L configuration:​ FOB US$145–321/set (manufacturer direct)

• Vision Solar 100L unpressurized SUS304:​ US$80–100/set at 1-set MOQ

• Zonyi Solar ZY-1NA 100L (27° stand):​ US$197/set at 10-piece MOQ

• Volume pricing:​ Better pricing at 20GP/40HQ container quantities

• 20GP container loading:​ Approximately 80 sets of 100L units; 40HQ:​ 172 sets

Final FOB pricing depends on inner tank thickness, outer tank material (SUS304 vs. SUS201 vs. color-coated galvanized), bracket material, certification package, and order volume. Request formal quotations from 2–3 verified factories.

Why This Configuration Wins in Warm-Climate Markets

The 27° all-304 100L non-pressure unit is the volume leader for several reasons:

• No freezing concerns​ in low-latitude regions where 27° tilt is optimal

• Simplest installation​ — compact integrated design, no pump, no controller, no electrical connection

• Lowest landed cost per litre​ — FOB prices start at US$75/set

• Full SUS304 construction​ ensures 10–15 year corrosion-free operation even in coastal humidity

• Thermosyphon reliability​ — no moving parts means minimal warranty claims

• Ideal household size​ — 100L suits 1–3 people, the dominant demographic in emerging residential markets

• 27° tilt​ maximizes annual solar harvest in latitude 15°–30° regions

Suitable Markets and Applications

Export Terms Summary

• MOQ:​ 1 set for samples; volume pricing from 10–20+ sets

• Payment:​ T/T, L/C, Western Union, D/P, PayPal

• Incoterms:​ FOB, CIF, CFR, EXW

• Nearest ports:​ Shanghai, Ningbo, Qingdao, Tianjin

• Lead time:​ 7 days (sample); 7–15 days (full container)

• Production capacity:​ 6,000–30,000 sets/month per factory

• Spare parts:​ 1% free with bulk orders

• Warranty:​ 5 years comprehensive; 15 years on vacuum tubes

• Certifications:​ CE, ISO9001, CCC baseline; Solar Keymark/SRCC/INMETRO/SABS optional

Optional Accessories

• Assistant tank​ (5L/8L/10L/15L) — automatic cold-water feed

• Electric backup heater​ (1500W/220V or 110V) — cloudy-day backup

• Magnesium anode rod​ — anti-corrosion for hard water regions

• Intelligent controller​ (TK-7/TK-8A) — temperature and water level display

• Booster pump​ — enhanced outlet pressure if tank height is insufficient

FAQ for International Buyers

1. What is the FOB price for a 27° all-304 100L non-pressure unit?

FOB US$75–300/setfromShanghai/Ningbodependingonconfiguration.Fullystainlesssteel(inner+outer+bracketallSUS304)unitsrangeUS$145–321/set. Sample orders at the higher end; container orders at the lower end.

2. Is the unit truly "all 304 stainless steel"?

The inner tank is always SUS304-2B food-grade stainless steel. For a fully stainless steel unit, specify SUS304 outer tank and SUS304 bracket in your inquiry. Many economical configurations pair SUS304 inner tank with SUS201 or color-coated galvanized outer tank and bracket to optimize cost.

3. Why is the bracket angle 27°?

27° is the optimal tilt angle for installations in latitude 15°–30° N/S regions. It maximizes annual solar irradiation capture while naturally shedding rain, dust, and debris. The angle can be customized to 18°/20°/38°/45° or any angle required for your target market.

4. How many units fit in a container?

Approximately 80 sets of 100L units per 20GP container; 172 sets per 40HQ container. Exact numbers depend on packaging configuration.

5. Does it work in cloudy weather?

Yes. The high-efficiency vacuum tubes capture diffuse radiation. An optional 1500W electric backup heater ensures continuous hot water supply on overcast days.

6. Can it handle hard water?

SUS304 stainless steel resists calcium scaling well. For hard-water regions, specify a magnesium anode rod and schedule periodic descaling every 3–5 years.

7. What certifications are available for my market?

Baseline: CE, ISO9001, CCC. Market-specific: Solar Keymark (Europe), SRCC (North America), INMETRO (Brazil), SABS (South Africa). Mexican market requires NOM-027-ENER and NOM-001-SCFI compliance.

8. How long does the system last?

Quality SUS304 inner tanks deliver 10–15 years of service life. Vacuum tubes carry 15-year warranties. The stainless steel bracket provides decades of corrosion protection. Overall system lifespan exceeds 20 years with proper maintenance.

9. Is installation complicated?

No. The compact integrated design enables simple plug-in installation on both flat and pitched roofs. No pump, no controller, no electrical work for the primary circuit. A qualified plumber can complete installation in 2–4 hours.

10. What is the optimal roof orientation?

True south for Northern Hemisphere installations, true north for Southern Hemisphere. The 27° tilt angle compensates for minor orientation deviations.

Why Source This Configuration from China

The 27° all-304 100L non-pressure solar water heater represents the optimal convergence of simplicity, material quality, and market fit. Chinese manufacturers in Zhejiang, Jiangsu, Shandong, and Guangdong have refined this product line for over 20 years, with automated argon arc welding, high-pressure polyurethane foaming, and systematic OEM services ensuring consistent quality at scale.

For distributors, this SKU offers four compelling advantages:

1. Market-proven demand​ — 100L non-pressure units are the #1 volume seller in low-latitude emerging markets

2. Differentiated quality​ — Full SUS304 construction commands premium margins over mixed-material competitors

3. Optimal tilt​ — 27° bracket matches the latitude of the largest solar water heater import markets (Mexico, Central America, Southeast Asia)

4. Simplest after-sales​ — No pump, no controller, no electrical components in the primary circuit means minimal warranty claims