Water Quality & Pressure
Guides on the water itself and the pressure behind it: hard water and softeners, whole-house and under-sink filtration, reverse osmosis, distillers, chlorine and sulfur smells, cloudy or discolored water, weak showers, and pressure that swings overnight. Water heaters live here too, tank, tankless and heat pump, along with anode rods, dip tubes, expansion tanks, thermostats and elements, and the leaks that start at the top or the bottom of a tank. You will find diagnosis articles that walk a symptom back to its cause, and buying guides that name specific products.
Picks are chosen from manufacturer specifications, installation instructions, warranty terms and plumbing code, with attention to fit and to whether replacement parts stay available. That judgment is read alongside manufacturer specifications and the standards a product is built to. Nobody pays to be included and there are no sponsored placements. Some links on these pages are affiliate links, mostly to Amazon; if you buy through one the site may earn a commission at no extra cost to you.
Softener upkeep: best water softener cleaner, picked by water type.
Water Heater Anode Rod Size: Which One Fits?
Which anode rod fits your water heater? 3/4-inch NPT thread, 1-1/16-inch hex, hex-head vs combination outlet anodes, and how to match the length.
4500 vs 5500 Watt Water Heater Element: Which Fits?
4500 or 5500 watt water heater element? Amps, recovery and breaker size from Rheem and A. O. Smith, and why the rating plate, not the upgrade, decides.
Read more: 4500 vs 5500 Watt Water Heater Element: Which Fits?
10 vs 20 Inch Water Filter Cartridge: Size Chart
A “10-inch” filter cartridge is really 9.75–9.88 in. long. Match length and diameter (2.5 or 4.5 in.) to your housing using Pentair’s own spec sheets.
Big Blue vs Standard Water Filter Housing: Which Fits?
Big Blue vs standard filter housing: cartridge width, port sizes, flow and pressure ratings from Pentair’s spec sheets, plus how to tell which one you have.
Read more: Big Blue vs Standard Water Filter Housing: Which Fits?
Sediment Filter Micron Rating: 5 vs 20 (and Up)
5 or 20 micron sediment filter? What the rating means, nominal vs absolute, when to stage coarse to fine, and which Pentek cartridges come in each rating.
Rheem and Ruud Tankless Error Codes, Explained
Rheem and Ruud tankless codes 11, 12, 10, 29, 1L, 88, P1 and A011 to A090 explained from Rheem’s manuals, with the owner checks and limits.
Bradford White ICON Status Light Codes, Explained
Bradford White ICON 1.0 and 2.0 flash codes from Bradford White’s service guides: what each pattern means and what an owner can safely check.
Read more: Bradford White ICON Status Light Codes, Explained
A. O. Smith Water Heater Status Light Codes
What 0, 1, 2, 4, 5, 7 and 8 flashes mean on an A. O. Smith gas water heater, straight from its manuals, plus how to relight and when to stop.
Navien NPE-A2 and NPE-S2 Error Codes, Explained
Navien E003, E012, E110, E016, E030 and E760 explained from Navien’s NPE-A2/S2 manual: what you can check, and which codes go to tech support.
Rinnai Tankless Error Codes: What Each Code Means
Rinnai tankless codes 10, 11, 12, 14, SS and LC explained from Rinnai’s own manual, with the checks you can safely make and when to stop.
Read more: Rinnai Tankless Error Codes: What Each Code Means
Best Electric Tankless Water Heaters (2026) by Climate
A licensed plumber’s electric tankless picks: EcoSmart ECOS 27 for a whole house, plus one-bathroom and one-sink units, sized by EcoSmart’s climate table.
Read more: Best Electric Tankless Water Heaters (2026) by Climate
Best Freeze Alarms for Home in 2026
Freeze alarms that alert you when an empty house gets cold, before pipes freeze: Wi-Fi, leak-and-freeze and long-range picks from a licensed plumber.
Best Water Heater Flush Kit: Tankless and Tank Picks
A tankless heater needs a pump kit; a tank heater needs a sediment tool. Three verified picks, what is in each kit, and the valves you need first.
Read more: Best Water Heater Flush Kit: Tankless and Tank Picks
Best Water Softener Salt: Pellets vs Crystals (2026)
A licensed plumber’s picks for water softener salt: pellet, solar crystal and potassium chloride, plus how much salt to keep in the brine tank.
Read more: Best Water Softener Salt: Pellets vs Crystals (2026)
A.O. Smith vs Rheem Water Heaters: Which Should You Buy
A.O. Smith and Rheem build the same categories and sell under other badges. A licensed plumber on which one to buy and what actually decides it.
Read more: A.O. Smith vs Rheem Water Heaters: Which Should You Buy
Heat Pump vs Tankless Water Heater: Which Fits Your House?
A licensed plumber compares heat pump and tankless water heaters, and the electrical-panel fact that quietly settles most of these decisions.
Read more: Heat Pump vs Tankless Water Heater: Which Fits Your House?
Thermostatic Mixing Valve
Choose a thermostatic mixing valve by ASSE listing, connection and flow. Compare heater-outlet and under-sink options, with manual and warranty caveats.
Water Pressure Higher at Night? How to Catch an Overnight Spike
A daytime gauge reading misses the peak. How to use a max pointer gauge to record what your water pressure actually does overnight.
Read more: Water Pressure Higher at Night? How to Catch an Overnight Spike
Water Heater Dip Tube: Running Out of Hot Water Too Fast?
A licensed plumber on broken dip tubes — why a cracked one halves your usable hot water, what those white flecks in the aerators are, and how to tell it from a dead element.
Read more: Water Heater Dip Tube: Running Out of Hot Water Too Fast?
Water Heater Thermostat or Element? How to Tell Them Apart
A licensed plumber on electric water heater thermostats — why the upper one starts the whole sequence, how to tell a dead thermostat from a dead element, and the refill step that saves the new part.
Read more: Water Heater Thermostat or Element? How to Tell Them Apart
Air Chamber vs Water Hammer Arrestor: Which Do You Have?
A licensed plumber on air chambers vs water hammer arrestors — why chambers waterlog and need recharging, how to tell which your house has, and why pressure comes first.
Read more: Air Chamber vs Water Hammer Arrestor: Which Do You Have?
How Often to Change a Water Filter Pitcher Cartridge
A licensed plumber on pitcher filter life — why gallons beat months, the signs a cartridge is spent, and why an expired filter is worse than no filter at all.
Read more: How Often to Change a Water Filter Pitcher Cartridge
Water Heater Drain Pan: What It Stops (and What It Doesn’t)
A licensed plumber on water heater drain pans — why a pan without a drain line is half a pan, why it won’t stop a ruptured tank, and the sensor placement that actually saves you.
Read more: Water Heater Drain Pan: What It Stops (and What It Doesn’t)
Where to Put Water Leak Sensors (Most People Get This Wrong)
A licensed plumber on leak sensor placement — the priority list from water heater to sump pit, why the drip pan alone misses leaks, and the limit of a sensor that only alarms.
Read more: Where to Put Water Leak Sensors (Most People Get This Wrong)
How to Descale a Tankless Water Heater (Lukewarm? Start Here)
A licensed plumber on descaling a tankless water heater — why scale causes lukewarm output and flow errors, the isolation valves you need first, and the step-by-step flush.
Read more: How to Descale a Tankless Water Heater (Lukewarm? Start Here)
Water Heater Expansion Tank: Do You Need One? (T&P Dripping?)
A licensed plumber on thermal expansion tanks — why a closed system makes your T&P valve drip, how to size and pre-charge one so it actually works, and the potable-rating trap.
Read more: Water Heater Expansion Tank: Do You Need One? (T&P Dripping?)
Water Heater Element Replacement: Which One Failed and What to Buy
A licensed plumber on electric water heater elements — how the symptom tells you which element died, matching voltage and wattage, and the refill step that saves the new part.
Read more: Water Heater Element Replacement: Which One Failed and What to Buy
What a Water Leak Actually Costs in 31 Major U.S. Cities (2025 Rates)
The same household leak costs $66 a year in Las Vegas and $390 in San Francisco. We priced EPA leak volumes against 2025 water and sewer rates in 31 U.S. cities.
Read more: What a Water Leak Actually Costs in 31 Major U.S. Cities (2025 Rates)
Cost to Install a Reverse Osmosis System (2026)
A licensed plumber breaks down what a reverse osmosis system really costs in 2026 — under-sink vs whole-house, equipment vs install, DIY vs pro, plus ongoing filter cost.
Cost to Install a Whole House Water Filter (2026)
A licensed plumber breaks down what a whole-house water filter really costs in 2026 — equipment vs install, DIY vs pro, city vs well — with honest numbers.
Read more: Cost to Install a Whole House Water Filter (2026)
Best Water Distiller for CPAP (2026): A Plumber’s Picks
A licensed plumber’s pick of the best home water distillers for CPAP users — why distilled water matters for your machine, how much you’ll use, and whether a distiller beats buying jugs.
Read more: Best Water Distiller for CPAP (2026): A Plumber’s Picks
Reverse Osmosis vs Water Softener (2026): Why You Might Need Both
A licensed plumber explains the real difference between reverse osmosis and a water softener — they fix different problems, and many homes need both. No hype.
Read more: Reverse Osmosis vs Water Softener (2026): Why You Might Need Both
Water Distiller vs Reverse Osmosis (2026): A Plumber’s Honest Comparison
A licensed plumber breaks down distillation vs reverse osmosis — what each removes, taste, cost, waste, and which one is right for your water. Honest, no hype.
Read more: Water Distiller vs Reverse Osmosis (2026): A Plumber’s Honest Comparison
Best Whole House Water Filters in 2026 (A Licensed Plumber’s Picks)
Plumbing Picks is reader-supported. As an Amazon Associate, we earn from qualifying purchases at no extra cost to you. The best whole-house filter is the one matched to your water test and household flow. Sediment, chlorine, dissolved iron, hardness and bacteria are different problems. A larger filter or an extra cartridge does not automatically solve…
Read more: Best Whole House Water Filters in 2026 (A Licensed Plumber’s Picks)
Best Water Distillers for Home Use (2026): Plumber’s Picks
Compare Megahome glass collection, H2O Labs 300SS stainless exterior and VEVOR plastic-jug configurations, with batch output, operating instructions and water-treatment claim limits.
Read more: Best Water Distillers for Home Use (2026): Plumber’s Picks
Water Heater Leaking From the Top? Causes & Fixes
Heads up: some links on this page are Amazon affiliate links — you pay no more, and as an Amazon Associate we earn from qualifying purchases. Water pooling on top of your water heater is far better news than water under it. A leak from the bottom usually means the tank itself has rusted through…
Read more: Water Heater Leaking From the Top? Causes & Fixes
Water Heater Anode Rod: When and How to Replace It
Heads up: some links on this page are Amazon affiliate links — you pay no more, and as an Amazon Associate we earn from qualifying purchases. The anode rod is the most overlooked part in your water heater, and Rheem says running without one “will greatly shorten the life of the glass lined tank.” It…
Read more: Water Heater Anode Rod: When and How to Replace It
Water Heater Making Noise? Popping & Rumbling Explained
A water heater that pops, rumbles, or crackles is usually trying to tell you one thing: there is a layer of sediment cooked onto the bottom of the tank. It is rarely an emergency, but it is a sign your heater is working harder, costing you more, and aging faster than it should. The noise…
Read more: Water Heater Making Noise? Popping & Rumbling Explained
Why Is My Water Cloudy, Brown, or Discolored?
Heads up: some links on this page are Amazon affiliate links — you pay no more, and as an Amazon Associate we earn from qualifying purchases. Discolored water is alarming, but the color is a clue, and most causes are either harmless or fixable. The trick a plumber uses is to read three things: the…
Is Reverse Osmosis Worth It? + Best Under-Sink RO Systems (2026)
Disclosure (#ad): Plumbing Picks is reader-supported. When you buy through links on this page we may earn an affiliate commission, at no extra cost to you. As an Amazon Associate we earn from qualifying purchases. Quick answer For most homes the best under-sink RO system is the iSpring RCC7AK — it adds an alkaline remineralization…
Read more: Is Reverse Osmosis Worth It? + Best Under-Sink RO Systems (2026)
Water Softener Not Regenerating? Causes & Fixes
Heads up: some links on this page are Amazon affiliate links — you pay no more, and as an Amazon Associate we earn from qualifying purchases. Hard-water spots are back, your soap will not lather, but the brine tank is full of salt, so what gives? A softener that is not regenerating has stopped running…
How to Increase Water Pressure in Your Whole House
Heads up: some links on this page are Amazon affiliate links — you pay no more, and as an Amazon Associate we earn from qualifying purchases. If you have already worked through the quick fixes, cleaned the aerators, checked one fixture versus the whole house, and the water still dribbles everywhere, the problem is your…
Read more: How to Increase Water Pressure in Your Whole House
Best Smart Water Leak Detectors With Automatic Shutoff (2026)
The best automatic water shutoff system for most houses is the Moen Flo: it mounts on the main, watches flow and pressure, and closes the valve by itself when a leak is detected. If you cannot cut pipe, a YoLink EVO operator can turn a compatible existing ball valve instead; check shaft and bracket fit…
Read more: Best Smart Water Leak Detectors With Automatic Shutoff (2026)
Water Heater Pilot Light Won’t Stay Lit? Fix the Thermocouple
Heads up: some links on this page are Amazon affiliate links — you pay no more, and as an Amazon Associate we earn from qualifying purchases. You head to the basement, the water is cold, and the burner is dead. You relight the pilot, it catches, you hold the knob for a minute, let go,…
Read more: Water Heater Pilot Light Won’t Stay Lit? Fix the Thermocouple
Low Water Pressure in the Shower Only? A Plumber’s Quick Fixes
If only your shower is weak, the problem is the fixture, not your home’s water pressure. A licensed plumber walks through the cheap fixes, easiest first.
Read more: Low Water Pressure in the Shower Only? A Plumber’s Quick Fixes
Water Heater Leaking From the Bottom? A Plumber’s Diagnosis
Water under your heater is alarming but not always a dead tank. A licensed plumber walks through finding the real source — and when it means replace, not repair.
Read more: Water Heater Leaking From the Bottom? A Plumber’s Diagnosis
Cost to Install a Tankless Water Heater (2026)
A tankless water heater is one of the few upgrades where homeowners consistently underestimate the install cost – they price the unit, not the retrofit. The real install number is rarely about the heater on the shelf; it is about the gas line, the venting, and sometimes the electrical panel behind it. Here is what…
How to Flush a Water Heater (Plumber’s Step-by-Step)
Flushing your water heater once a year is the best way to make it last. A licensed plumber walks through the safe, step-by-step way to clear out sediment.
Read more: How to Flush a Water Heater (Plumber’s Step-by-Step)
Why Does My Water Smell Like Rotten Eggs? (Sulfur Fix)
Rotten-egg water smell is hydrogen sulfide. A licensed plumber shows how to tell if it’s your water heater or your water supply, and how to fix each.
Read more: Why Does My Water Smell Like Rotten Eggs? (Sulfur Fix)
Why Is My Water Heater Leaking? A Plumber’s Causes & Fixes
A leaking water heater is usually a cheap connection or valve fix — unless the tank itself has rusted. A licensed plumber shows you how to tell the difference.
Read more: Why Is My Water Heater Leaking? A Plumber’s Causes & Fixes
Water Heater Repair Cost in 2026 (and When to Just Replace It)
What common water heater repairs really cost in 2026, part by part — and the honest rule for when repairing is throwing money at a tank you should replace.
Read more: Water Heater Repair Cost in 2026 (and When to Just Replace It)
How Much Does It Cost to Install a Water Softener? (2026 Plumber’s Guide)
A licensed plumber’s real 2026 cost to install a water softener — equipment vs labor, cost by type, DIY vs pro, and what actually swings the bill. No upsell.
Read more: How Much Does It Cost to Install a Water Softener? (2026 Plumber’s Guide)
Why Is My Water Bill So High? A Plumber’s Leak-Detective Guide
A high water bill almost always means water is leaving the house unused. A licensed plumber walks through the meter test, the usual suspects, and the fix.
Read more: Why Is My Water Bill So High? A Plumber’s Leak-Detective Guide
Water Softener vs Whole-House Filter: Which Do You Need?
A licensed plumber explains water softener vs whole-house filter — what each fixes, how to tell which you need, and when you need both.
Read more: Water Softener vs Whole-House Filter: Which Do You Need?
No Hot Water? A Plumber’s Troubleshooting Guide
No hot water? A licensed plumber walks through the gas and electric causes, the checks to do yourself first, and when to call a pro.
Gas vs Electric Water Heater: Which Should You Buy?
A licensed plumber compares gas vs electric water heaters — running costs, install, recovery speed, and which is right for your home.
Read more: Gas vs Electric Water Heater: Which Should You Buy?
Tank vs Tankless Water Heater: A Plumber’s Honest Comparison
A licensed plumber breaks down tank vs tankless water heaters — real costs, lifespan, hot-water output, and which one is actually worth it for your home.
Read more: Tank vs Tankless Water Heater: A Plumber’s Honest Comparison
Best Water Filter Pitcher (2026): A Plumber’s Top 3 Picks
A licensed plumber’s picks for the best water filter pitcher — what actually holds up, what to skip, and how to choose.
Read more: Best Water Filter Pitcher (2026): A Plumber’s Top 3 Picks
Best Water Heaters in 2026 (A Licensed Plumber’s Picks)
A licensed plumber’s picks for the best tank water heaters in 2026 — reliable 40–50 gallon gas and electric units from the brands plumbers actually install.
Read more: Best Water Heaters in 2026 (A Licensed Plumber’s Picks)
Best Tankless Water Heaters in 2026 (A Licensed Plumber’s Picks)
A licensed plumber’s picks for the best tankless water heaters in 2026 — gas and electric units sized for real homes, with endless hot water and lower bills.
Read more: Best Tankless Water Heaters in 2026 (A Licensed Plumber’s Picks)