DCPM vs DQB vs DZB vs DFSU vs DFSN: Which Surface Pump Do You Need?

The short answer: all five series are surface-mounted solar pumps, but they serve different jobs. DCPM is the all-rounder centrifugal pump (6-85 m³/h, 14-28m). DQB and DZB are high-pressure boosters (only 2-3 m³/h, but 25-65m head). DFSU is the large-flow workhorse (up to 160 m³/h). DFSN is the compact budget centrifugal (16-36 m³/h, 9-24m). Pick by your flow and head, not by brand.

If your water source is at or near ground level — a river, pond, tank, or shallow well — a surface pump is often the smarter choice than a submersible. But “surface pump” covers a lot of ground, and buyers often ask me which of our series they need. Here is the honest comparison, using real specs from the catalog.

The one-minute summary

Reading a model number (real example)

Every model name carries its specs. Take DCPM15-14-48-550:

• DCPM = series
• 15 = max flow, 15 m³/h
• 14 = max head, 14 m
• 48 = nominal voltage, 48V DC
• 550 = rated power, 550W

Same logic across all five series. If you can read one, you can read all of them — and you can compare any two models instantly.

DCPM: the all-rounder centrifugal

12 models. Flow 6-85 m³/h, head 14-28 m, power 550-3000 W. Voltages: 48V, 72V, 110V.

DCPM is the middle ground: more flow than a booster, more head than the compact series at the low end, and it scales up to serious output. Examples:

• DCPM6-26-48-550 — 6 m³/h at 26 m head, 550W, 48V: a tidy single-purpose pump for a garden or small plot
• DCPM27-21-110-1500 — 27 m³/h at 21 m head, 1500W, 110V: serious field irrigation
• DCPM50-17-110-1500 — 50 m³/h at 17 m head: big flow, moderate lift

Use DCPM when your flow need lands in the 6-85 m³/h band and your lift is under ~28 m.

DQB and DZB: the high-pressure boosters

10 models combined. Flow only 2-3 m³/h, but head 25-65 m, power 210-750 W. Voltages 24V, 48V, 72V.

These two are the opposite philosophy: small flow, high pressure. They exist to push water UP — to a roof tank 25-65 m above the pump, or through a pressurized line. Examples:

• DQB2-25-24-210 — 2 m³/h at 25 m head, 210W, 24V: roof-tank filling for a house
• DQB3-65-72-750 — 3 m³/h at 65 m head, 750W, 72V: serious elevation
• DZB2-25-24-210 — the DZB twin (self-priming head) of the same specs

The key difference between DQB and DZB is the pump head: DZB is self-priming (fill the pump head once and it draws water on its own), while DQB needs the whole head and suction line filled with water. Some models also come with AC/DC auto-switch versions (marked -A/D). If your job is “lots of pressure, not lots of water,” this family is the answer.

DFSU: the large-flow workhorse

16 models. Flow 20-160 m³/h, head 15-30 m, power 750-7500 W. Nominal voltage 110V with wide-voltage AC/DC options.

DFSU is for moving serious water. 160 m³/h is a river-scale flow — think community supply, several hectares of flood irrigation, or filling a large reservoir fast. Examples:

• DFSU20-15-110-750 — 20 m³/h at 15 m head, 750W: entry-level large flow
• DFSU43-17-110-1500 — 43 m³/h at 17 m head: mid-size irrigation
• DFSU35-15-110-1100 and larger models climb to 160 m³/h

Note: DFSU models run at 110V nominal (with HV wide-voltage variants), so panel wiring and controller selection matter more here than on the low-voltage series.

DFSN: the compact budget centrifugal

18 models. Flow 16-36 m³/h, head 9-24 m, power 400-1500 W. Voltages 24V, 48V, 72V, 110V.

DFSN is the lightest-duty family: the smallest power (400W entry), the lowest head (9 m minimum), and the widest voltage spread — which makes it friendly for small solar setups. Examples:

• DFSN16-9-24-400 — 16 m³/h at 9 m head, 400W, 24V: smallest footprint, low lift
• DFSN21-15-48-750 — 21 m³/h at 15 m head, 750W: the sweet spot for small farms
• DFSN27-24-110-1500 — 27 m³/h at 24 m head, 1500W: top of the range

Use DFSN when your lift is modest (under ~24 m) and your flow need is small-to-medium. It is usually the most economical starting point.

Side-by-side decision guide

What are you pumping from?
├── Surface water (river, pond, tank, shallow well) — you need a SURFACE pump
│     ├── Need HIGH PRESSURE, LOW FLOW (roof tank, sprinkler)?
│     │     └── DQB or DZB (2-3 m³/h, 25-65 m head)
│     ├── Need MEDIUM flow, moderate lift?
│     │     ├── Lift under ~24 m, small-medium job → DFSN
│     │     └── 6-85 m³/h, lift up to 28 m → DCPM
│     └── Need BIG flow (hectares, community)?
│           └── DFSU (up to 160 m³/h)
└── Water is deep underground (>8 m) — you need a SUBMERSIBLE pump instead

Four real sizing examples (matching a real spec)

Every example follows the same three steps: work out your required head, work out your required flow (daily need ÷ sun hours), then match to a model and size the panels.

Example 1 — Small farm garden, shallow well (→ DFSN)

• Situation: watering a vegetable garden from a shallow well. Lift to the garden: 8 m. Daily need: 10 m³. Sun hours: 5.
• Required flow: 10 ÷ 5 = 2 m³/h.
• Match: DFSN16-9-24-400 — 16 m³/h at 9 m head, 400W, 24V. Head covers 8 m with margin; flow far above 2 m³/h means the pump runs well under an hour a day — plenty of buffer.
• Panels: 400W × 1.3 = 520W → one 550W panel is enough. 24V system, VOC under the 60V limit — the simplest, cheapest build.

Example 2 — Mid-size field irrigation from a pond (→ DCPM)

• Situation: irrigating 1 hectare from a pond. Lift: 12 m. Daily need: 60 m³. Sun hours: 5.
• Required flow: 60 ÷ 5 = 12 m³/h.
• Match: DCPM15-14-48-550 — 15 m³/h at 14 m head, 550W, 48V. Flow above the 12 m³/h target, head to spare.
• Panels: 550W × 1.3 = 715W → two 550W panels (1100W) gives comfortable margin. VOC stays under the 120V limit.

Example 3 — Roof tank on a tall building (→ DQB/DZB)

• Situation: filling a 10 m³ roof tank standing 30 m above the pump. Daily need: 8 m³. Sun hours: 5.
• Required flow: 8 ÷ 5 = 1.6 m³/h — a small flow, but the HEAD is the problem.
• Match: DQB3-50-48-550 — 3 m³/h at 50 m head, 550W, 48V. 30 m lift is comfortably within 50 m. A DFSN or DCPM cannot reach 30 m at all.
• Panels: 550W × 1.3 = 715W → two 550W panels.

Example 4 — Large-scale community irrigation (→ DFSU)

• Situation: irrigating several hectares from a river. Lift: 10 m. Daily need: 400 m³. Sun hours: 6.
• Required flow: 400 ÷ 6 = 67 m³/h — you need big flow.
• Match: DFSU68-25-300-3000-A/D(HV) — 68 m³/h at 25 m head, 3000W, AC/DC auto-switch with wide voltage (VOC <450V). 25 m head covers the 10 m lift with huge margin.
• Panels: 3000W × 1.3 = 3900W → eight 550W panels (4400W). The HV controller handles the larger array.

The pattern at a glance

The rule: head first, then flow. If a pump cannot reach your head, nothing else matters. If it reaches the head, pick the flow that matches your daily need divided by your sun hours — then size the panels at 1.3× pump power, staying under the model’s VOC limit.## Voltage and solar panel matching

All five series run on DC (with AC/DC and wide-voltage variants on some models), and all require the same panel rule: solar panel power ≥ 1.3 × pump power, with the array voltage kept under the model’s VOC limit (printed on each spec, e.g. VOC <60V, <120V, or <220V).

Low-voltage models (24V/48V) pair with smaller arrays and simpler controllers — ideal for portable or small setups. High-voltage models (110V+, or HV variants) need larger arrays but suffer less cable loss over long runs.

Which one should you buy?

To summarize the honest advice:

• Small farm, low lift, tight budget → DFSN (compact, wide voltage choice, lowest entry power)
• General irrigation, mid-size plots, need flow range → DCPM (6-85 m³/h, up to 28 m)
• Roof tank, sprinkler pressure, elevation → DQB or DZB (high head, low flow)
• Hectares of land or community supply → DFSU (up to 160 m³/h)

Not sure? Tell me your water source, your lift, and your daily water need — comment below or send me a message and I will match you to the exact model, free.

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