iSpring UVF55FS 55W Whole House UV Water Filter

Name: iSpring UVF55FS 55W Whole House UV Water Filter
Brand: iSpring
Price: 338.99 USD

UV disinfection · 12 GPM · Treats bacteria · $339 at iSpring as of Oct 2026

The iSpring UVF55FS is a 55 W UV-C sterilizer in a 37.5 in. 304 stainless steel reactor for wells that test positive for bacteria. It is rated up to 12 GPM, and its smart flow-sensing ballast switches the lamp on at 0.66 GPM so the lamp only runs when water flows, with Auto, Move and Stop modes. No UV dose is published, no NSF/ANSI 55 or other certification is stated, and iSpring gives no pathogen-reduction percentage on the product page.

The lamp is rated up to 9,000 hours and should be replaced annually, with the quartz sleeve cleaned every 6-12 months. The unit is 38 by 3 by 3 in., weighs 7.5 lb, mounts on included wall brackets, has 1 in. MNPT ports and needs a 100-120 V outlet. There are no chemicals and no wastewater. The manual limits feed water to 0.3 ppm iron, 120 ppm hardness and 70% minimum UV transmittance and wants particles above 20 microns filtered out first, so plan the train accordingly.

Price was $338.99 at ispringfilter.com as of Oct 2026 (regular price). Warranty is 1 year upon registration, with 30-day money-back, lifetime tech support and paid 3-, 5- and 10-year extensions. Install is DIY.

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iSpring UVF55FS 55W Whole House UV Water Filter well water uv disinfection

Specifications

Verified 2026-10-06. Fields the manufacturer does not publish are marked “Not stated”.

iSpring UVF55FS 55W Whole House UV Water Filter specifications
Model	UVF55FS (updated UVF55 with smart flow-sensor ballast)
Type	UV disinfection
Treats	Bacteria; also chlorine-resistant microorganisms (maker wording: 'impurities commonly found in private wells and city water')
Service flow	12 GPMRated flow 12 GPM (product title and UVF55FS manual). No UV dose (mJ/cm2) is published on the page or in the manual. Manual 'Specs and Conditions' (table read via PDF text extraction): operating pressure 4-85 psi, maximum hardness 120 ppm, maximum iron 0.3 ppm, minimum UVT 70%, vertical or horizontal installation; the warranty terms require feed pressure 'no less than 4 psi and no greater than 85 psi' and chlorine of 1.0 mg/L or less. The manual also says incoming water must be 'free of particles larger than 20 microns', to install the UV 'after the filters as the last stage', and to fit a pressure regulator 'if the water pressure is over 43 psi ... to protect the quartz sleeve' (which conflicts with the 85 psi maximum in the same manual). Flow sensor switches the lamp on at 0.66 GPM (product page, read 2026-10-05; not re-read 2026-10-06).
Capacity	Not stated55 W lamp rated up to 9,000 hours; replace lamp annually, clean quartz sleeve every 6-12 months.
Media / technology	55 W UV-C lamp in 37.5 in. 304 stainless steel reactor with quartz sleeve and flow-sensing ballast
Connection	1 in. MNPT
Installation	DIY'Easy DIY installation' with wall-mount brackets; 1 in. MNPT ports; 100-120 V / 50-60 Hz outlet required.
Warranty	1-year manufacturer warranty'1-Year manufacturer warranty upon registration activated'; 30-day money-back guarantee; lifetime tech support. Paid 3/5/10-year extended warranties offered.
Certifications	Not statedNo NSF/ANSI 55 or other third-party certification is stated on the product page or in the UVF55FS manual; no pathogen reduction percentage or UV dose is published. WQA certified-product search (find.wqa.org) returned zero results for 'iSpring', 'iSpring Water', '123Filter', 'WGB32B' and 'RCC7AK' on 2026-10-06 (a control search for 'Culligan' returned listings). NSF certified-product database (info.nsf.org), searched 2026-10-06: iSpring Water Systems LLC (Cumming, GA) is listed only under NSF/ANSI 58 (RO systems) and NSF/ANSI/CAN 372 (WSP ...ARJ spin-down variants). UVF55FS does not appear.
Dimensions	38 x 3 x 3 in.
Weight	7.5 lb
Price	$339 at iSpring as of Oct 2026

Published features

55 W UV lamp, 12 GPM
37.5 in. 304 stainless steel reactor chamber
Smart flow sensor ballast with Auto / Move / Stop modes
Lamp life up to 9,000 hours
No chemicals, no wastewater
Wall-mount brackets and manual included

Pros and cons

Pros

Flow-sensing ballast only runs the lamp when water flows
Low purchase price for a 12 GPM whole-house UV unit
In-stock Amazon listing for the exact model

Cons

No NSF/ANSI 55 certification and no published UV dose
1-year warranty
Manual limits feed water to 0.3 ppm iron, 120 ppm hardness, 70% minimum UVT and particles under 20 microns, so most wells need pre-treatment ahead of it

Our take

The UVF55FS is the low-price way to add UV to a well that already has sediment and iron under control, and the flow-sensing ballast is a nice touch at this price. What you give up is any certification or published dose and all but a 1-year warranty. If a lab result or lender requires certified disinfection, the NSF/ANSI 55 Class A Pentair Premium UV is the one to look at.

Not sure it is the right size for your flow and your water test? Work through the sizing guide, or compare every system we cover on the best well water filtration systems (2026) list.

Where to buy

$339 at iSpring as of Oct 2026. Prices change; the links open the current listing.