RESMO RS3800 800 GPD Tankless Review: Specs, Pros and Cons
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This resmo rs3800 800 gpd tankless review focuses on the key specifications that define this under-sink water filtration system. The unit is a tankless reverse osmosis system designed for high daily output. It produces 800 gallons per day through an eight-stage filtration process. The membrane filters particles down to 0.0001 microns. It also maintains a 2:1 pure to drain ratio. These specs suggest a system built for continuous use without storage tanks. The compact dimensions allow it to fit under most standard sinks. You get real-time quality monitoring via the integrated faucet display.
What stands out
- 800 GPD capacity fills an 8-ounce glass in 5 seconds
- 8-stage filtration with 0.0001 micron reverse osmosis membrane
- 2:1 pure to drain ratio for efficient water usage
- NSF/ANSI 372 lead-free material certification
- LED dual outlet faucet with filter life indicators
Who it fits
Good fit for
This system suits households with high water consumption needs. The 800 GPD output handles multiple taps simultaneously. The tankless design saves cabinet space compared to traditional units. The 2:1 ratio helps reduce wastewater for environmentally conscious buyers. Families who want real-time water quality data will appreciate the LED display. The compact footprint fits under most standard kitchen sinks. You need a power outlet and drainage channel for installation.
Who should skip it
You should look at another option if you have limited cabinet space. The unit measures 17.1 inches long, 15 inches high, and 5.6 inches wide. You must have a nearby power socket for the smart faucet. The installation requires a pre-set hole of 1 to 1.4 inches. If you cannot provide drainage for the wastewater, this system will not work. Buyers seeking a completely passive system without electricity should avoid this model.
Verdict: The RESMO RS3800 delivers high flow rates and efficient water usage in a compact, tankless design. It is a solid choice for homes needing fast, filtered water without storage tanks.
Key specs for the Resmo RS3800
Capacity (GPD): 800
This rating means the system can produce up to 800 gallons of filtered water in a single day. For a typical household, this capacity supports multiple users without requiring a storage tank. You get a steady supply of purified water for drinking, cooking, and ice making. This high output suits families with significant water usage needs, ensuring you do not run dry during peak times.
Filtration Stages: 8
An eight-stage process involves multiple layers of pre-filters, the reverse osmosis membrane, and post-filters. This structure removes a wide range of contaminants, including chlorine, sediment, and heavy metals. The additional stages help improve taste and odor by using activated carbon. You benefit from more comprehensive purification compared to simpler three-stage units, ensuring cleaner water at every point of use.
Micron Rating: 0.0001 microns
This number indicates the size of the pores in the reverse osmosis membrane. A rating of 0.0001 microns is extremely fine, allowing only water molecules to pass through. It blocks dissolved solids, salts, and microscopic particles that larger filters miss. This precision ensures that the water you drink is free from many common impurities found in municipal tap water systems.
Pure to Drain Ratio: 2:1
This ratio means the system produces two gallons of clean water for every one gallon sent to the drain. A 2:1 ratio is considered efficient for modern tankless systems. It helps reduce water waste compared to older models that may produce only one gallon of pure water per gallon of wastewater. This efficiency is useful for maintaining lower utility bills while still getting high-quality filtered water.
Design: Tankless
A tankless design means the system filters water on demand rather than storing it in a large pressure vessel. This saves under-sink space, which is often limited in kitchens. It also prevents the stale taste or bacterial growth that can occur in stored water tanks. You get fresh water directly from the faucet, which is ideal for small households or those prioritizing compact installation.
Design and build details
The RESMO RS3800 is a tankless unit designed for under-sink installation. According to the listing, the physical dimensions are 17.1 inches in length, 15 inches in height, and 5.6 inches in width. This compact footprint allows it to fit into standard cabinet spaces without consuming excessive room. The tankless design eliminates the need for a bulky storage pressure tank, which helps maximize available storage space beneath your sink.
The system holds NSF/ANSI 372 certification for lead-free materials. This specification ensures that the components in contact with drinking water do not leach harmful levels of lead. The unit also carries FCC certification, indicating compliance with electromagnetic interference standards for its electronic components. These certifications provide a baseline for material safety and operational reliability.
You will need to ensure your installation site meets specific requirements. The listing states that the faucet requires a pre-set hole between 1 and 1.4 inches in diameter. Additionally, the installation location must include a power outlet and a drainage channel. The system integrates an LED dual-outlet faucet with a smart display. This display provides real-time water quality monitoring and filter life indicators, allowing you to track performance without opening the cabinet.
Setup and everyday use details
Installation requires specific conditions under your sink. You need a pre-set hole measuring between one and 1.4 inches for the faucet. The unit also requires a nearby power socket and a drainage channel. These are mandatory for proper operation. The system connects directly to your water line without a storage tank, saving space.
Daily use is managed through the LED dual outlet faucet. This feature integrates double water design with real-time quality monitoring. The smart display provides instant feedback on water purity. You can see the status of your water at a glance. A filter life indicator on the faucet shows when replacements are needed. This helps you maintain consistent water quality without guesswork.
The system produces 800 gallons per day. The flow rate is 0.89 gallons per minute. This speed allows you to fill an eight-ounce glass in five seconds. The pure to drain ratio is two to one. This means for every two gallons of clean water, one gallon is sent to the drain. This efficiency reduces waste compared to older models.
The eight-stage filtration uses composite technology. It includes pre and post activated carbon filters. These reduce odors and chlorides effectively. The reverse osmosis membrane filters particles down to 0.0001 microns. This removes heavy metals, salts, and large particles. The unit is certified lead-free by NSF/ANSI 372. It also holds FCC certification. You get quiet operation due to noise reduction technology built into the system.
Before you buy the RESMO RS3800
Owning this tankless system requires you to verify your under-sink space fits its dimensions. You must ensure a power outlet and drainage channel are available nearby. The faucet needs a pre-set hole between one and 1.4 inches. Since it produces 800 gallons daily, you get fast flow without a storage tank. This suits large families needing steady water. You should budget for filter replacements to maintain the eight-stage purification. The system reduces chlorine and heavy metals effectively. Check that your water pressure meets the unit’s requirements for optimal performance. Unlike tank models, this unit saves space under your sink. It integrates an LED faucet for real-time quality monitoring. You do not need extra tanks, which simplifies installation. Compare this against other tankless options by looking at their pure-to-drain ratios. The 2:1 ratio helps conserve water during the filtration process. Regular maintenance ensures the 0.0001 micron membrane works correctly. Always follow the manufacturer’s guidelines for filter changes.
Check before you buy
- Verify under-sink dimensions fit the 17.1-inch length.
- Confirm a power outlet is nearby for operation.
- Check for a drainage channel for wastewater.
- Ensure faucet hole size is between one and 1.4 inches.
The product at a glance
RESMO RS3800 800 GPD Tankless RO System
Best for: High-volume households with under-sink power access
- Filtration Stages
- 8
- Capacity (GPD)
- 800
- Design
- Tankless
- Pure to Drain Ratio
- 2:1
- Certification
- NSF/ANSI 372, FCC
- Filtration Type
- Reverse osmosis
View on Amazon: RESMO RS3800 800 GPD Tankless RO System Affiliate link
The RESMO RS3800 is an under-sink, tankless reverse osmosis system with 800 gallons per day capacity. It uses 8-stage filtration with a 0.0001 micron membrane to remove contaminants. The unit features a 2:1 pure-to-drain ratio and an LED faucet that displays water quality. It requires a power outlet and drain line under your sink for operation.
Pros
- 800 GPD tankless design for fast flow
- NSF/ANSI 372 lead-free certification
- LED faucet shows real-time water quality
- 2:1 pure-to-drain water ratio
Cons
- Requires a nearby power socket for operation
- Needs a dedicated drain channel for wastewater
- Faucet requires a 1-1.4 inch pre-set hole
Good fit if
- You need high daily water volume without a storage tank
- You want real-time water quality monitoring via LED display
- You have space for a power outlet under the sink
Skip if
- You cannot install a power outlet under your sink
- You lack a nearby drain line for wastewater
- You prefer a faucet that does not require electrical power
Verdict: The RESMO RS3800 800 GPD Tankless RO is a solid choice for households needing rapid, tankless filtration with visible water quality data. It fits users who have the necessary electrical and plumbing infrastructure under their sink.
Specifications side by side
| Spec | RESMO RS3800 800 GPD Tankless RO System |
|---|---|
| Filtration Stages | 8 |
| Capacity (GPD) | 800 |
| Design | Tankless |
| Pure to Drain Ratio | 2:1 |
| Certification | NSF/ANSI 372, FCC |
| Filtration Type | Reverse osmosis |
| Installation Type | Under sink |
| Micron Rating | 0.0001 microns |
| Capacity | 800 GPD |
| Dimensions | 17.1 × 5.6 × 15 inches |
| Model | RS3800-M |
Frequently asked questions
Is the Resmo RS3800 tankless or does it have a storage tank?
The RESMO RS3800 is a tankless reverse osmosis system. It produces filtered water on demand rather than storing it in a pressurized container. This design supports a high daily output of 800 gallons. You get fresh water without the need for bulky under-sink storage tanks.
How many filtration stages does the RESMO RS3800 have?
This unit features an eight-stage filtration process. The multiple stages ensure thorough removal of contaminants before the water reaches your faucet. The system is also NSF Certified, which verifies that the filtration components meet specific industry standards for safety and performance.
What is the pure to drain water ratio for this system?
The RESMO RS3800 operates with a 2:1 pure to drain ratio. For every two gallons of clean water produced, one gallon is sent down the drain. This efficiency rating helps you manage water usage while maintaining a steady supply of filtered water for your household.
Does the Resmo RS3800 require electricity to operate?
Yes, this tankless system requires a nearby power socket to function. The internal pump and controls need electrical power to drive the filtration process. You must ensure there is an accessible outlet under your sink before installation to ensure proper operation of the unit.
Is the RESMO RS3800 NSF Certified?
Yes, the system holds NSF Certification. This indicates that the product has been tested and verified to meet specific public health and safety standards. You can trust that the filtration materials and processes comply with recognized industry benchmarks for water quality and system integrity.
What are the physical dimensions of the Resmo RS3800 unit?
The unit measures 17.1 inches in length, 15 inches in height, and 5.6 inches in width. This compact footprint is designed to fit into standard under-sink cabinets. You should measure your available space to ensure it accommodates these specific dimensions before purchasing the system.