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Our Verdict (Best for)
The Home Master TMHP-L is a strong pick if you want a high-quality and mostly US-made under sink RO with ultra-fast faucet flow. But, first-timers might get frustrated during setup due to the confusing system configuration, short faucet tubing, and lackluster instructions. Once it’s up and running, the Home Master TMHP-L is easy to use providing plenty of water. We also like the permeate pump which cuts wastewater up to 80%, the UV disinfection stage, and the remineralization which treats your water twice, before and after the storage tank, for up to twice the mineral content. The TMHP-L also had excellent results in our lab testing, and the filtered water was perfect. More pros/cons: The system isn’t cheap but comes with a 5-year warranty, the wall mount is flimsy, and it completely lacks NSF certifications/testing for contaminant reduction.
The Home Master TMHP-L HydroPerfection Loaded is a tank-based under sink reverse osmosis system that requires a plumbing connection. It’s designed for use as a drinking water filter and can purify both tap water and properly disinfected well water.
As usual, we’ve tested the system with our own hands:
- Hands-on experience: We installed/assembled, used, and maintained it.
- Filtration effectiveness: We sent an unfiltered and a filtered tap water sample to a professional lab for analysis in order to determine real-life contaminant reduction capabilities (and remineralization). Plus, we checked for NSF certifications and other test data.
- More testing: We performed a taste & odor test, a filtration speed test, a tank-filling speed test, a usable water test, and a wastewater test.
- All other product aspects: We considered initial + long-term cost, product warranties, additional features, frequent customer complaints, etc.
Contents
Overall Rating: /5.00
Filtration: /5.00
Usability: /5.00
Costs: /5.00
| Type: | Under Sink Reverse Osmosis System |
| Price (May 5, 2025, w/o Short-Term Sales): | $530.04 |
| Estimated Yearly Cost (May 5, 2025): | ~$140-150 (Save Up to 12% With Filter Subscription) |
Overall Rating: /5.00
What We Like Most
- Achieved excellent results in our lab testing for contaminant reduction.
- Filtered water tasted and smelled 100% clean.
- Easy to use with ultra-fast faucet flow and plenty of water provided.
- Can remineralize water twice (once before tank filling to prolong tank life).
- Cold UV sterilization chamber won’t heat water.
- Suited for well water with iron (KDF-85 filter).
- Looks and feels well-made (except wall mount).
- Simple yet solid faucet with 3 faucet options.
- Very low wastewater ratio thanks to permeate pump which also increases faucet flow and speeds tank filling.
- Reasonable purchase cost and fairly average annual maintenance fees.
- Excellent 5-year (limited) warranty.
- Made in USA (except tank and UV module).
- Helpful customer service.
What We Don’t Like
- No NSF certifications/testing for contaminant reduction.
- Not the easiest system to install (confusing configuration, lackluster instructions, our drain saddle was the wrong size, some quick-connect fittings are difficult to remove, very short faucet tubing limits placement.
- Wall mount is not sturdy (the system fell off once).
- Confusing configuration makes filter replacement more challenging than with other systems (though easy to remove).
- No filter life indicator.
- 3rd-party customers complained about difficulty connecting the faucet.
How the Home Master TMHP-L Compares to…
10 Other Under Sink Reverse Osmosis Systems
In this video, Sara explains why, among the 11 under sink RO systems we’ve tested, we think the Home Master TMHP-L is a strong pick if you want a high-quality and mostly US-made unit with ultra-fast faucet flow.
Please note: Our full guide on the best under sink reverse osmosis systems is available here.
Video Chapters + Comparison Sheet
- Link to Comparison Sheet
- 00:00 – Intro
- 00:22 – What’s New?
- 01:11 – Our 11 Under Sink ROs
- 01:54 – How We Tested & Rated
- 05:08 – Our Recommendations
- 06:11 – Best Overall (Cloud RO)
- 20:57 – 2 Best Tankless Units (Waterdrop G3P600 & X12)
- 35:38 – Highest Filtration Score (Aquasana SmartFlow)
- 37:22 – Made in USA (USWS All American & Home Master TMHP-L)
- 41:28 – Budget Pick (APEC ROES-50 Essence)
- 42:50 – Summary
18 Other Under Sink Water Filters
In this video, Sara explains why, among the 19 under sink water filters we’ve tested, we think the Home Master TMHP-L is a strong pick if you want a high-quality and mostly US-made under sink RO with ultra-fast faucet flow.
Please note: Our full guide on the best under sink water filters is available here.
Video Chapters + Comparison Sheet
- Link to Comparison Sheet
- 00:00 – Intro
- 00:34 – How We Tested & Rated
- 01:53 – Our Recommendations
- 03:01 – Best Overall (Cloud RO)
- 15:11 – 2 Best Tankless ROs (Waterdrop G3P600 & X12)
- 27:26 – Best Non-RO Filter (Epic Smart Shield)
- 31:22 – Highest Filtration Score (Aquasana SmartFlow)
- 32:02 – Made in USA (USWS All American & Home Master TMHP-L)
- 32:34 – Budget RO Pick (APEC ROES-50 Essence)
- 32:51 – AO Smith AO-US-200 & Culligan US-EZ-4
- 33:34 – Summary
Full Analysis of the Home Master TMHP-L
Please note: We repeated our lab test for remineralization because we initially tested the Home Master TMHP-L HydroPerfection Loaded with its storage tank turned off (as we usually do for tank-based under-sink RO systems). With the tank off, the TMHP-L provides only one remineralization pass. For our second test, we ran the system with the tank on, which reflects normal operation where the water is remineralized twice – once before and once after the storage tank.
Filtration: /5.00
1. Lab Results: /5.00
Remember that our before vs after lab comparison is not an exact science. It’s informational and subject to variability, inaccuracies, and interferences caused by natural fluctuations in water quality, accidental contamination, human error, instrumentation issues, and more. Furthermore, our lab-testing is limited to those contaminants present in our water supplies and at their respective concentrations. As such, it can only give us a general idea for how effective a certain water treatment product might be.
Lab Results Chart (Filtration)
| Potentially Harmful | Aesthetic Issues | Feed Water Level | Filtered Water Level | Reduction Rate | |
| Water Disinfectants | |||||
| Chlorine (mg/L) | ✖ | ✖ | 1.2 | 0 | 100% |
| Disinfection Byproducts | |||||
| Bromodichloromethane (µg/l) | ✖ | 2.61 | 0 | 100% | |
| Bromoform (µg/l) | ✖ | 3.45 | 0 | 100% | |
| Dibromochloromethane (µg/l) | ✖ | 5.08 | 0 | 100% | |
| Chloroform (µg/l) | ✖ | 0.99 | 0 | 100% | |
| Metals | |||||
| Copper (mg/L) | ✖ | ✖ | 0.08 | 0 | 100% |
| Barium (mg/L) | ✖ | 0.05 | 0 | 100% | |
| Boron (mg/L) | ✖ | 0.06 | 0.02 | 67% | |
| Zinc (mg/L) | ✖ | 0.01 | 0.01 | 0% | |
| Lithium (mg/L) | ✖ | 0.01 | 0 | 100% | |
| Strontium (mg/L) | ✖ | 0.49 | 0.01 | 98% | |
| Salts | |||||
| Nitrate (N) (mg/L) | ✖ | 1.91 | 0 | 100% | |
| Fluoride (mg/L) | ✖ | 0.36 | 0.11 | 69% | |
| Other | |||||
| Uranium (µg/L) | ✖ | 1 | 0 | 100% | |
| RO Salt Rejection | |||||
| TDS (mg/L) | ✖ | 296.4 | 24.6 | 92% (Uses Remineralization) | |
| Impurities NOT Detected in Unfiltered Tap Water Sample | |||||
| Explanation: | |||||
| Full Removal | |||||
| Considerable Reduction | |||||
| Concentration More Than Double of Unfiltered Water Sample | |||||
| Potential Leaching Reached or Exceeded the Strictest Public Health Guideline We Could Find | |||||
Lab Results Chart (Remineralization)
| Home Master TMHP-L HydroPerfection Loaded | Health Guidelines | Average of Non-Remineralization Under Sink RO Systems We Tested |
|
| Comment | -The first number in each cell was measured using both remineralization passes; the second number in brackets represents just 1 remineralization pass (storage tank shut off). | ||
| Minerals | |||
| Magnesium (mg/L) | 0.40 (0.35†) | Minimum Level: 10 Optimum Level: 20-30 Source: WHO |
0.38 |
| Calcium (mg/L) | 4.54 (4.32†) | Minimum Level: 20 Optimum Level: ~50 Source: WHO |
1.74 |
| pH & Alkalinity | |||
| pH | 6.68 (6.68) | No Health Guideline | 6.91 |
| Alkalinity (mg/L) | 20† (<20†) | 30 to 400 (IDPH) | Most <20 |
| Explanation: | |||
| Within Range of Health Guideline | |||
| Not Within Range of Health Guideline | |||
| † = Concentration Not Significantly Higher Than Non-Remineralized Average | |||
*100% means reduction to below the minimum detection level. To learn more about our testing procedures check our editorial guidelines.
**Our remineralization lab results reflect water dispensed immediately after purification, representing the shortest possible contact time between purified RO water and remineralization media — a baseline scenario for mineral concentration. We used this approach to ensure consistency across all tested RO systems. Actual remineralization performance during regular everyday use is likely better but can vary significantly.
Link to Filtered Water Report
Link to Unfiltered Water Report
Link to Remineralization Re-Test (Both Passes)
Usability: /5.00
Costs: /5.00
Please note: This page is still a work in progress. Additional content and details will be added shortly – stay tuned!
About the Author(s)
Sara has been a lifelong home-improvement fan (she’s been hooked on This Old House since she was five) and taught herself any project she didn’t already know by watching YouTube tutorials. She is also an award-winning filmmaker. Armed with this skillset, Sara installs, primes, samples, uses, and maintains nearly every point-of-use water treatment systems we test – then brings her results to life on camera for our YouTube channel.
Raoul has a background in mechanical engineering and has been writing about home water treatment since 2015. He designs our product review processes, analyzes the results, and ties everything together. As editor-in-chief, he tries hard to keep the whole operation running smoothly behind the scenes.