ERI PX vs FEDCO HPB Comparison

ERI PX vs FEDCO HPB: Which SWRO Energy Recovery Device Is Right For You?

The two dominant SWRO energy recovery devices have fundamentally different mechanisms. ERI PX is an isobaric pressure exchanger using a rotating ceramic rotor — 97-98% efficiency at higher capital cost. FEDCO HPB is a hydraulic pressure booster (turbocharger) using a centrifugal turbine — 80-88% efficiency at lower capital cost with better tolerance for variable feed water.

Quick Verdict by System Size

System Size	Recommendation	Why
Under 10,000 GPD	Either, often skipped	Payback period too long for small systems
10,000 - 50,000 GPD	ERI PX (PX-220 to PX-300)	Higher efficiency compounds at continuous duty
50,000 - 200,000 GPD	ERI PX-Q300 to PX-Q400	Quiet series + 98% efficiency
Variable feed water (high TSS)	FEDCO HPB	Better tolerance for particulates
Tight CapEx budget	FEDCO HPB	~30% lower upfront cost

Detailed Comparison

Specification	ERI PX (Standard)	ERI PX-Q (Quiet)	FEDCO HPB
Mechanism	Isobaric (ceramic rotor)	Isobaric (refined rotor)	Centrifugal turbine
Efficiency	97%+	98%+	80-88%
Moving parts	1 (rotor)	1 (rotor)	Multiple (turbine + bearings)
Acoustic emission	~78 dB(A)	~71 dB(A)	~85 dB(A)
Typical service life	25+ years	25+ years	15-20 years
Maintenance interval	5 years	5 years	1-2 years
Capital cost (50,000 GPD class)	$45,000-65,000	$50,000-72,000	$28,000-38,000
Best for	Continuous-duty, energy-cost-sensitive	Hotels, hospitals, residential-adjacent	Variable feed, lower CapEx

Energy Cost Analysis

For a typical 50,000 GPD SWRO running 20 hours/day at $0.15/kWh:

No energy recovery: ~$120,000/year electricity
With FEDCO HPB (85% efficient): ~$50,000/year ($70,000/year savings)
With ERI PX (97% efficient): ~$36,000/year ($84,000/year savings)

The ERI PX captures an additional $14,000/year vs FEDCO HPB. Over a 20-year life, that's $280,000 — far exceeding the ~$25,000 capital cost difference.

Bottom line: For continuous-duty installations above 10,000 GPD, ERI PX wins on total cost of ownership in nearly all scenarios. FEDCO HPB is preferred when feed water has high turbidity, when CapEx is tight, or when operating hours are intermittent.

Installation Compatibility

Both devices integrate with standard SWRO trains using Danfoss APP high-pressure water pumps as the primary feed pressure source. Both require:

5 µm pre-filtration minimum
Stable feed pressure 30-50 psi from a booster pump
Brine return line piped directly back to the device's low-pressure inlet

FEDCO HPB has a slight edge in retrofitting older systems where the pump arrangement was designed without an isobaric device in mind.

Frequently Asked Questions

Is ERI PX or FEDCO HPB better?

For most commercial SWRO above 10,000 GPD operating continuously, ERI PX delivers better total cost of ownership due to 97-98% efficiency vs 80-88%. FEDCO HPB wins on capital cost and particulate tolerance.

Can I use both ERI PX and FEDCO HPB in the same system?

Yes, hybrid configurations exist where FEDCO HPB handles the bulk energy recovery and ERI PX provides additional efficiency on a side stream. This is uncommon and only justified at very large scale (500,000+ GPD).

What's the payback period for ERI PX vs FEDCO HPB?

ERI PX typically pays back in 14-22 months on energy savings vs no-recovery. FEDCO HPB pays back in 10-16 months due to lower capital cost. Both are excellent investments for continuous-duty systems.

Does FEDCO HPB need replacement parts more often?

FEDCO HPB has multiple bearings + turbine wear surfaces requiring inspection every 1-2 years. ERI PX has a single ceramic rotor needing inspection every 5 years. Long-term maintenance cost favors ERI PX.

Get Expert Help Choosing

Tell us your SWRO system size, operating hours, and feed water quality — our engineers will recommend ERI PX or FEDCO HPB and provide a quote within 24 hours. Request a Quote