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The NU Aqua 100 GPD UV Under Sink RO delivers high daily output and UV purification for clean drinking water. If you are searching for nu aqua 100 gpd UV under alternatives, this list helps you find systems with similar core capabilities. The original model excels at producing 100 gallons per day while filtering through six stages. Its UV feature adds biological protection, and its under-sink design fits standard kitchen cabinets. However, you might need a different size, faucet finish, or water efficiency ratio. Some homes have tighter spaces or lower water pressure. Others may prefer alkaline remineralization or a 1:1 pure to drain ratio to save water. You might also want a different brand for specific component quality. We selected these alternatives because their published specifications overlap with the original. Each option shares key traits like under-sink installation and multi-stage filtration. This ensures you get comparable performance without sacrificing essential features. The list covers variations in capacity, weight, and added benefits like booster pumps. You can compare these specs to find the best fit for your kitchen layout and water needs.
01 How each alternative compares
NU Aqua 6-Stage UV RO System
This NU Aqua model shares the 100 GPD capacity and 6-stage UV filtration of the original, but adds a booster pump. That pump helps maintain flow rate when incoming water pressure is low, a feature the base model lacks. It is slightly taller at 19.5 inches compared to the 18-inch original. You get similar UV sterilization and under-sink installation. Choose this if your home has low water pressure or if you need that extra pump support for consistent daily output without changing brands.
iSpring RCC1UP 100 GPD Under Sink RO
The iSpring RCC1UP also offers 100 GPD capacity and 6-stage UV filtration with a booster pump. It is wider at 8 inches compared to the 5.5-inch original, which may affect fit in tight under-sink spaces. It weighs 35 pounds, heavier than the 28-pound NU Aqua. You get comparable purification and UV protection. Pick this if you prefer the iSpring brand reliability or need a slightly wider footprint for easier maintenance access. It sacrifices compactness for established brand support.
iSpring PH100 100 GPD Alkaline RO
This iSpring PH100 provides 100 GPD capacity but removes UV filtration, replacing it with an alkaline remineralization stage. It features a 1:1 pure-to-drain ratio, which is more water-efficient than standard RO systems. It is significantly larger, measuring 17.5 inches in length and 19 inches in height. You trade biological protection via UV for mineral-rich water and lower waste. Choose this if you prioritize water efficiency and taste over germ elimination, or if you already have a separate UV sterilizer.
Geekpure 6-Stage RO with UV Filter
The Geekpure system reduces capacity to 75 GPD but keeps the 6-stage UV filtration. It is lighter at 25 pounds and has a unique width of 9.5 inches. This smaller daily output makes it suitable for smaller households. You get similar UV protection and under-sink installation. Select this if you need a more compact footprint or do not require the full 100 GPD output. It gives up volume for a potentially easier fit in smaller cabinets while maintaining strong biological protection.
Express Water ROUV10D 100 GPD UV System
Express Water offers 100 GPD capacity and 6-stage UV filtration, matching the original output and protection. It includes a chrome faucet finish, differing from the original's stainless steel option. It weighs 30 pounds, slightly more than the NU Aqua. Dimensions are similar, with a 17-inch height. You get comparable purification and UV sterilization. Choose this if you prefer a chrome aesthetic for your kitchen fixtures. It maintains the high daily production rate while offering a different visual style for the faucet.
iSpring RCC7P-AK Alkaline RO
The iSpring RCC7P-AK removes UV filtration entirely, focusing on alkaline remineralization and a booster pump. It has a brushed nickel faucet finish. It is lighter at 20 pounds and narrower at 5.25 inches in width. You trade UV protection for mineral enhancement and potentially better taste. Pick this if you do not need UV sterilization and prefer alkaline water. It sacrifices biological protection for a lighter weight and a different faucet style, suitable for homes with adequate water pressure or those prioritizing mineral content.
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | NU Aqua 100 GPD UV Under Sink RO Best overall | high-flow under-sink UV purification | |
| 2 | NU Aqua 6-Stage UV RO System Best budget | high-output homes needing UV sterilization | |
| 3 | iSpring RCC1UP 100 GPD Under Sink RO Best premium | high-volume households needing UV protection | |
| 4 | iSpring PH100 100 GPD Alkaline RO Best 1:1 pure to drain | water-efficient households wanting alkaline taste | |
| 5 | Geekpure 6-Stage RO with UV Filter Best 75 gpd | UV purification and compact under-sink fit | |
| 6 | Express Water ROUV10D 100 GPD UV System Best chrome | high-output households wanting UV protection | |
| 7 | iSpring RCC7P-AK Alkaline RO Best brushed nickel | Low-pressure homes seeking alkaline water |
NU Aqua 100 GPD UV Under Sink RO
Best for: high-flow under-sink UV purification
- Installation Type
- Under Sink
- Daily Production Rate
- 100 GPD
- Filtration Stages
- 6-Stage
- Certifications
- NSF
- Features
- UV Filter
- Use
- Drinking Water
The NU Aqua 6-Stage UV system delivers 100 gallons per day of filtered water for under-sink installation. It uses a UV filter and HydraCoil membrane to reject over 1000 dissolved solids. The unit includes a stainless steel faucet, tank, and a PPM meter. Its 100 GPD output doubles standard flow rates. This setup suits households needing high daily production and advanced purification for drinking water.
- 100 GPD high flow rate
- 6-stage filtration with UV sterilization
- NSF certified components
- Includes PPM meter for testing
- Quick-connect fittings for easy setup
- 28-pound weight requires sturdy mounting
- 18-inch height may limit low cabinet fit
- 100 GPD capacity is lower than some 150 GPD alternatives
- You need a 100 GPD output for your household
- You want UV sterilization for added safety
- You prefer a stainless steel faucet
- You have very limited under-sink height
- You need a flow rate above 100 GPD
- You cannot support a 28-pound unit
Verdict: NU Aqua 100 GPD UV Under Sink RO is a robust choice for families prioritizing high daily water production and UV purification. It fits well in standard kitchens where space allows for its 18-inch height and 28-pound weight.
NU Aqua 6-Stage UV RO System
Best for: high-output homes needing UV sterilization
- Installation Type
- Under Sink
- Daily Production Rate
- 100 GPD
- Filtration Stages
- 6-Stage
- Certifications
- NSF
- Features
- UV Filter, Booster Pump
- Application
- Kitchen
This NU Aqua unit is a 6-stage under sink reverse osmosis system with a booster pump and UV filtration. It delivers 100 gallons per day, doubling standard flow rates. The design includes a stainless steel faucet and quick-connect fittings for easy installation. It targets homes needing high output and advanced purification. The system comes with a PPM meter and a 3-year warranty for long-term reliability.
- 100 GPD daily production rate
- 6-stage filtration with UV sterilization
- Includes booster pump for higher pressure
- NSF certified lead-free faucet
- Complimentary PPM meter included
- Wider 5.5-inch footprint may limit tight under-sink storage
- 19.5-inch height restricts placement in low-clearance cabinets
- Standard 3-year warranty is shorter than some competitors
- You need a high 100 GPD output for large families
- You want UV sterilization for added pathogen protection
- You prefer a stainless steel faucet design
- You have very low clearance under your sink
- You need a system with alkaline remineralization
- You prefer a smaller 75 GPD footprint
Verdict: NU Aqua 100 GPD RO UV System fits households that need fast water flow and UV purification. It is a strong option for those with standard under-sink dimensions.
iSpring RCC1UP 100 GPD Under Sink RO
Best for: high-volume households needing UV protection
- Installation Type
- Under Sink
- Daily Production Rate
- 100 GPD
- Filtration Stages
- 6-Stage
- UV Purification
- 11W Ultraviolet UV Filter
- Features
- UV Filter, Booster Pump
- Use
- Drinking Water
The iSpring RCC1UP is a 6-stage under-sink reverse osmosis system rated at 100 gallons per day. It includes an 11W ultraviolet filter for pathogen control and a booster pump for consistent flow. The unit measures 15 by 8 by 18 inches and weighs 35 pounds. You need an electrical outlet for the UV and pump functions. This system targets households wanting high-volume purified drinking water.
- 100 GPD daily production rate
- 11W ultraviolet purification stage
- Reduces over 1,000 contaminants
- Includes booster pump for flow
- Quick-fit tubing installation
- Requires an electrical outlet
- Weighs 35 pounds
- Dimensions are 15 by 8 by 18 inches
- You need a high daily water output
- You want ultraviolet purification added to RO
- You have an outlet under your sink
- You have no power source nearby
- You need a compact unit under 30 pounds
- You prefer a non-electric filtration method
Verdict: iSpring 100 GPD RO System with UV suits homes requiring high-volume purified water with added pathogen protection. It fits users who can dedicate space and power for a robust under-sink system.
iSpring PH100 100 GPD Alkaline RO
Best for: water-efficient households wanting alkaline taste
- Installation Type
- Under-sink
- Daily Production Rate
- 100 GPD
- Filtration Stages
- 6-stage
- Pure to Drain Ratio
- 1:1
- Remineralization
- Alkaline remineralization
- Use
- Drinking Water
The iSpring PH100 is a 6-stage under-sink reverse osmosis system with 100 GPD output. It features a 1:1 pure-to-drain ratio, which reduces water waste compared to standard models. The alkaline remineralization stage restores healthy minerals and balances pH for better taste. It includes a brushed nickel faucet and US-made filters. This system suits households wanting efficient water use and improved flavor without excessive waste.
- 100 GPD daily production rate
- 1:1 pure to drain water ratio
- 6-stage filtration with alkaline remineralization
- US-made filters and Dupont membrane
- 16-inch width requires under-sink space
- 19-inch height may limit cabinet fit
- 17.5-inch length adds to footprint
- You want a 1:1 waste ratio to save water
- You prefer alkaline water with restored minerals
- You need 100 GPD capacity for daily use
- You have very narrow under-sink cabinets
- You want a system with a built-in pump
- You prefer acidic or neutral pH water
Verdict: iSpring PH100 Alkaline 100 GPD RO offers a balanced mix of efficiency and taste for homes with adequate under-sink space. It fits buyers who value low water waste and mineral-rich drinking water.
Geekpure 6-Stage RO with UV Filter
Best for: UV purification and compact under-sink fit
- Installation Type
- Under-sink
- Daily Production Rate
- 75 GPD
- Filtration Stages
- 6-stage
- Certifications
- NSF
- UV Purification
- UV filter
- Use
- Drinking Water
This Geekpure system uses a 6-stage filtration process with a UV filter to treat drinking water. It produces 75 gallons per day, which is lower than the 100 GPD output of most alternatives on this list. The unit includes a 2.8-gallon storage tank and measures 14.2 inches in length. It fits under most sinks and uses NSF-certified components for reliable performance.
- 75 GPD daily production rate
- 6-stage filtration with UV purification
- NSF-certified tube and membrane
- Includes 2.8-gallon storage tank
- 75 GPD output is lower than the 100 GPD standard for this list
- 25-pound weight is heavier than lighter compact units
- 2.8-gallon tank holds less water than larger 3.2-gallon alternatives
- You need UV purification to ensure water purity
- You have limited under-sink space for the 14.2-inch length
- You want a system with NSF-certified internal components
- You require a higher 100 GPD production rate
- You need a larger 3.2-gallon or bigger storage tank
- You prefer a lighter unit under 20 pounds
Verdict: Geekpure 6-Stage RO System 75 GPD offers certified UV purification and compact dimensions, making it a solid choice for households prioritizing water safety over maximum daily output.
Express Water ROUV10D 100 GPD UV System
Best for: high-output households wanting UV protection
- Installation Type
- Under-sink
- Daily Production Rate
- 100 GPD
- Filtration Stages
- 6-stage
- Features
- UV Filter
- Faucet Finish
- Chrome
- Dimensions
- 15 × 5 × 17 inches
This Express Water system combines reverse osmosis with UV purification for under-sink installation. It produces 100 gallons per day across six filtration stages. The chrome faucet finish matches modern kitchen fixtures. A built-in leak detector shuts off water flow if moisture is detected. The unit weighs 30 pounds and measures 15 by 17 by 5 inches.
- 100 GPD daily production rate
- UV-C light destroys biological impurities
- Emergency leak stop detector included
- Chrome faucet finish
- Six-stage filtration reduces lead and chlorine
- Weighs 30 pounds, which is heavier than lighter alternatives
- Dimensions of 15 by 17 by 5 inches require specific under-sink space
- Standard 1-year limited warranty is shorter than some competitors
- You need a 100 GPD output for household use
- You want UV purification alongside reverse osmosis
- You prefer a chrome faucet finish
- You have limited under-sink space due to its 30-pound weight and size
- You require a warranty longer than one year
- You prefer a different faucet finish than chrome
Verdict: Express Water 100 GPD Chrome RO suits households needing high daily output and biological protection. It fits kitchens where chrome fixtures match the decor and under-sink space accommodates its bulk.
iSpring RCC7P-AK Alkaline RO
Best for: Low-pressure homes seeking alkaline water
- Installation Type
- Under Sink
- Filtration Stages
- 6-Stage
- Remineralization
- Alkaline Remineralization
- Faucet Finish
- Brushed Nickel
- Use
- Drinking Water
- Dimensions
- 14.5 × 5.25 × 19 inches
This iSpring system adds a sixth alkaline stage to standard reverse osmosis filtration. It includes an electric booster pump to maintain performance in low-pressure homes. The unit reduces over 1,000 contaminants and restores minerals for better taste. You get a brushed nickel faucet with a compact under-sink footprint. It suits those who want enhanced water quality and reliable flow without complex maintenance.
- Sixth stage alkaline remineralization balances pH
- Booster pump ensures consistent flow in low pressure
- Transparent first-stage housing allows easy filter monitoring
- Brushed nickel faucet finish included
- Heavier build at 20 pounds compared to lighter competitors
- Lower daily capacity than the 100 GPD models on this list
- Requires electrical outlet for the booster pump operation
- You need consistent water pressure in a low-pressure home
- You prefer alkaline, mineral-balanced drinking water
- You want a durable system with transparent filter housing
- You require a high-capacity 100 GPD output
- You cannot install an electrical outlet under the sink
- You prefer a lighter system for easier installation
Verdict: iSpring RCC7P-AK Alkaline RO System delivers reliable filtration with a booster pump and mineral restoration. It fits households prioritizing water quality and pressure stability over maximum daily volume.
02 Specifications side by side
| Spec | NU Aqua 100 GPD UV Under Sink RO | NU Aqua 6-Stage UV RO System | iSpring RCC1UP 100 GPD Under Sink RO | iSpring PH100 100 GPD Alkaline RO | Geekpure 6-Stage RO with UV Filter | Express Water ROUV10D 100 GPD UV System | iSpring RCC7P-AK Alkaline RO |
|---|---|---|---|---|---|---|---|
| Installation Type | Under Sink | Under Sink | Under Sink | Under-sink | Under-sink | Under-sink | Under Sink |
| Daily Production Rate | 100 GPD | 100 GPD | 100 GPD | 100 GPD | 75 GPD | 100 GPD | – |
| Filtration Stages | 6-Stage | 6-Stage | 6-Stage | 6-stage | 6-stage | 6-stage | 6-Stage |
| Pure to Drain Ratio | – | – | – | 1:1 | – | – | – |
| Certifications | NSF | NSF | – | – | NSF | – | – |
| Remineralization | – | – | – | Alkaline remineralization | – | – | Alkaline Remineralization |
| UV Purification | – | – | 11W Ultraviolet UV Filter | – | UV filter | – | – |
| Capacity | 100 GPD | 100 GPD | 100 GPD | 100 GPD | 75 GPD | 100 GPD | – |
| Features | UV Filter | UV Filter, Booster Pump | UV Filter, Booster Pump | Alkaline, Remineralization | UV Filter | UV Filter | Alkaline |
| Faucet Finish | – | – | – | – | – | Chrome | Brushed Nickel |
| Use | Drinking Water | – | Drinking Water | Drinking Water | Drinking Water | – | Drinking Water |
| Application | Kitchen | Kitchen | – | – | – | – | – |
| Intended Use | Home | Home | – | – | – | – | – |
| Dimensions | 15 × 5.5 × 18 inches | 15 × 5.5 × 19.5 inches | 15 × 8 × 18 inches | 17.5 × 16 × 19 inches | 14.2 × 9.5 × 18.1 inches | 15 × 5 × 17 inches | 14.5 × 5.25 × 19 inches |
| Weight | 28 pounds | – | 35 pounds | – | 25 pounds | 30 pounds | 20 pounds |
| Size | RO – Stage 6 UV | Stage 6 UV | – | – | 6 Stage with UV Filter | 100 Gallons/Day | – |
| Color | White | White | White | White | White | Chrome | Brushed Nickel Faucet |
| Model | WU-100GPD-NP-UV | WU-100GPD-WP-UV | RCC1UP | PH100 | RO6-UV | ROUV10D | RCC7P-AK |
03 Frequently asked questions
What is the best alternative to the NU Aqua 100 GPD UV under sink?
The NU Aqua 6-Stage UV RO System is the top budget alternative. It offers the same 100 GPD capacity and 6-stage filtration as the original model. This system includes a booster pump to help maintain water flow. It fits standard under-sink spaces and provides essential UV sterilization for home use.
Is there a premium alternative with UV purification?
The iSpring RCC1UP 100 GPD Under Sink RO is the best premium option. It delivers 100 GPD of purified water using 6 stages of filtration. This system includes a UV filter for pathogen protection. It is slightly wider at 8 inches but offers robust performance for high-volume households.
Which alternative offers the best water efficiency?
The iSpring PH100 100 GPD Alkaline RO is the most water-efficient choice. It features a 1:1 pure to drain ratio, meaning it wastes less water than standard systems. This model adds alkaline minerals for better taste. It requires more under-sink space due to its larger dimensions.
Can I find a smaller capacity alternative with UV?
The Geekpure 6-Stage RO with UV Filter is a strong compact alternative. It produces 75 GPD, which is lower than the 100 GPD original. This system is lighter and fits into tighter under-sink cabinets. It provides certified UV purification for households that prioritize safety over maximum daily output.
Does any alternative include a chrome faucet?
The Express Water ROUV10D 100 GPD UV System features a chrome faucet finish. It matches the 100 GPD capacity of the NU Aqua model. This system includes UV filtration for biological protection. The chrome finish helps it blend with modern kitchen decor while providing high daily water output.
Which alternative is best for low water pressure?
The iSpring RCC7P-AK Alkaline RO System is ideal for low-pressure homes. It includes a booster pump to ensure stable water flow. This system provides 6-stage filtration with alkaline remineralization. It features a brushed nickel faucet and is one of the lightest options at 20 pounds.
