Iwaki vs SEKO Dosing Pump: Control, Degassing, Materials, Support
Iwaki vs SEKO dosing pump is a question we hear from distributors, OEM skid builders and plant buyers almost every week. Both brands have decades in solenoid metering pumps and both are common on low flow duties, so naming a winner is pointless. This comparison sticks to the Iwaki EHN series and the SEKO TEKNA and KOMPACT series, and looks at four things that decide most orders: control, degassing, wetted materials and after-sales support. Prices and lead times move too fast to be useful here, so they are left out.
Iwaki vs SEKO dosing pump: where each range sits
The Iwaki EHN is a digitally controlled solenoid pump. Stroke rate runs from 1 to 360 spm and stroke length is adjustable by knob, which gives a wide turndown. It accepts 100–240 VAC and the drive and control unit are built to an IP66-equivalent level.
SEKO organizes its solenoid pumps by control version plus flow size. TEKNA comes as AKS (manual), AKL (manual with level input), APG (proportional), TPG (digital multifunction) and TPR (built-in pH/ORP). KOMPACT covers duties of only a few liters per hour. Housings are rated IP65, and most versions take a wide voltage range, though a few KOMPACT versions such as AMS are 240 V only.
The model code on both brands carries a lot of information. Our guides to the Iwaki EHN model code and SEKO solenoid pump models break them down.
Control options compared
Control is where most Iwaki vs SEKO dosing pump debates start, because it decides how the pump fits the existing panel. Both brands cover normal external control. The difference is how. The Iwaki EHN has EXT and STOP functions as standard. In EXT mode it can multiply or divide incoming pulses, which makes flow pacing from a water meter simple. For a 0–20 mA analogue input, you typically move up to an advanced model such as EHN-YN.
SEKO works by version choice. For 4–20 mA or pulse, pick APG or TPG. For pH or ORP control, pick TPR and connect the probe straight to the pump, which removes a separate controller. On small pools and cooling towers that is a neat solution, and it often tips the Iwaki vs SEKO dosing pump decision toward SEKO.
Rewiring when you switch brands
Terminal definitions differ completely, so never copy the old wiring onto a new pump. Iwaki lets you choose M-ON or M-OF logic for the STOP input, while SEKO level inputs depend on the version. Before any Iwaki vs SEKO dosing pump swap, check the new manual line by line.
Degassing and gas lock
Sodium hypochlorite and hydrogen peroxide release gas, and gas lock is the most common solenoid pump complaint. Iwaki offers an auto-degassing head, and standard heads have an air vent valve you open with a knob. An EHN-YN fitted with the FCM flow monitor goes further. If it sees no suction flow, it runs at full speed (360 spm) to clear the lock, and if that fails it stops and raises an alarm.
SEKO literature shows typical installations with a degassing head, and some series have a manual vent valve to help priming. For gassing chemicals, the Iwaki vs SEKO dosing pump question matters less than giving the supplier the exact chemical so they fit the right head.
Iwaki vs SEKO dosing pump wetted materials
SEKO solenoid pumps come standard with a PVDF pump head, ceramic valve balls and a PTFE diaphragm. PVDF handles most water treatment chemicals, so materials are rarely the hard part of a SEKO selection.
Iwaki offers more head options: clear PVC, glass fiber reinforced PP, PVDF and SUS316. That lets you match the chemical precisely, and a clear PVC head lets operators see bubbles inside. The flip side is a higher chance of picking the wrong one. Strong sulfuric acid or solvents usually need a careful check of the material chart. In an Iwaki vs SEKO dosing pump comparison, think of SEKO as simpler and Iwaki as more flexible here.
After-sales support and channels
On paper, an Iwaki vs SEKO dosing pump support comparison looks even, since both are international brands. SEKO literature mentions direct sales teams in more than 20 countries and customers in more than 120. In practice, support depends on your local distributor more than on the logo. Ask whether common spares are in stock, whether a technician can visit, and how quickly diaphragms and valve kits arrive.
Spare part availability often settles the Iwaki vs SEKO dosing pump question for remote sites. For a broader view across other brands, see our solenoid metering pump brand comparison.
What to send your supplier before ordering
Whichever way your Iwaki vs SEKO dosing pump choice leans, a complete inquiry gets a faster and more accurate answer:
- Chemical name, concentration and temperature, plus any gassing or crystallizing behavior
- Maximum and minimum dose rate and the line pressure at the injection point
- Control signal: manual, pulse, 4–20 mA or direct pH/ORP
- Tank level switch and required alarm outputs
- Site power supply and mounting style, wall or floor
With these details, both suppliers can quote comparable options, and you can line them up side by side.
Conclusion
The Iwaki vs SEKO dosing pump choice usually comes down to the application. Pick Iwaki EHN when you need wide stroke adjustment, a head material matched closely to a difficult chemical, or auto-degassing with FCM flow monitoring. Pick SEKO TEKNA or KOMPACT when a standard PVDF head is enough, you want a control version that fits exactly, or you need a pump that reads a pH/ORP probe directly. Neither is better in every case. It depends on chemical, control signal and local support. Browse the Iwaki and SEKO brand pages, or send your duty through our contact page for a recommendation.
FAQ
Iwaki vs SEKO dosing pump: which is better for hypochlorite?
Both work if the head is right. For gassing chemicals an auto-degassing or degassing head is generally recommended.
Can a SEKO pump read a pH probe directly?
Yes. The TEKNA TPR version has built-in pH/ORP control and accepts a probe with a BNC connector.
Can I replace an Iwaki pump with SEKO?
Usually yes, but wiring and mounting differ. Check signal terminals, tube fittings and the base before swapping.
Which brand resists corrosion better?
It depends on the chemical and head material. SEKO standardizes on PVDF, while Iwaki offers several head materials.
Which series suits very low flow dosing?
For a few liters per hour, look at SEKO KOMPACT or the smaller Iwaki EHN models, sized to injection pressure.