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.
Radiator Valves
Compare radiator valve bodies from Danfoss and Honeywell Home: exact sizes, angle patterns, separate thermostats and fit checks before ordering parts.
Water Heater Installation Kit
Water heater install kits and connectors: SharkBite push-fit kit, Max braided (140°F) and corrugated (180°F) lines with shutoff valves, and threaded options.
Air Separators
Compare hydronic air separators, automatic vents and radiator bleeders. Check exact connections, orientation, fluid limits and vent-discharge pressure.
Best Foot Valve
Choose a foot valve for a shallow-well pump: Merrill FVNL100 vs FVNL125, Flomatic dealer options, screen clearance, priming and diagnosis before replacement.
Best Pitless Adapter
Choose a pitless adapter by casing, drop pipe and discharge fit. Compare Merrill models, one-inch PE pipe, insert fittings and checks for a well professional.
Boiler Expansion Tank
Choose a boiler expansion tank by system volume, temperature, fill pressure and fluid type. Compare hydronic vs potable tanks and understand precharge checks.
Best TDS Meter (2026)
The best TDS meter for home water: HM Digital TDS-4, Apera TDS20 and EC60, and the DM-2 RO monitor. Learn what TDS shows and why it is not a safety test.
Elkay Bottle Filler Filter
Which Elkay filter fits your bottle filling station or fountain: 51300C, 51600C or 51299C, what the filter lights and error E013 mean, and how to change it.
How to Read Your Water Quality Report
Read a Consumer Confidence Report without confusing MCLs, health goals, action levels, averages and sample ranges. Know when a tap test is needed.
EcoSmart vs Stiebel Eltron Tankless
EcoSmart vs Stiebel Eltron electric tankless: ECOS 18 vs Tempra 20 and ECOS 27 vs Tempra 29 on flow, breakers, controls and warranty terms.
iSpring vs APEC Reverse Osmosis
iSpring vs APEC reverse osmosis: RCC7-BN vs ROES-50 on certified claims, water pressure limits, hookups, rated output, filter life and warranty terms.
The Best Refrigerator Water Filters (2026) by Fridge Brand
The best refrigerator water filter for your fridge: genuine everydrop, GE, Samsung and Frigidaire cartridges with their NSF and IAPMO certification claims.
Read more: The Best Refrigerator Water Filters (2026) by Fridge Brand
Condensing or Non-Condensing Tankless?
Condensing vs non-condensing tankless water heaters from Rheem, Rinnai and Navien manuals: efficiency, PVC or stainless vent, condensate and outdoor units.
Best Water Filter for Microplastics (2026)
Water filters whose NSF/ANSI 401 listing names microplastics: under-sink, faucet mount, pitcher and fridge picks, with the exact model and filter to buy.
Best Water Hardness Test Kit (2026)
Water hardness test kits to size a softener or check one: Hach drop-count kit and Varify and JNW Direct strips, with units, iron and well-water notes.
Well Pump Control Box (2026)
Which well pump control box fits your 3-wire submersible: match maker, horsepower and voltage, with a Red Lion sizing chart and signs the box has failed.
Best Whole-House Water Filter and Softener Combos
Filter and softener combos from maker documents and certifier listings: Kenmore Elite 520, GE GXMD30W, AFW Fleck and PRO+AQUA, with sizing and iron limits.
Read more: Best Whole-House Water Filter and Softener Combos
Best Countertop Water Filter (2026)
Countertop water filters from maker documents: AquaTru and Bluevua RO, Aquasana and Culligan carbon units, with certified claims and well-water limits.
Electric vs Gas Tankless Water Heater
Electric vs gas tankless from maker charts: hot water at your groundwater temperature, panel amps vs gas line and vent, and Stiebel and Rheem picks.
Best Rain Shower Heads (2026)
Fixed rain shower heads from Kohler, Delta and Moen, checked against maker sheets: flow by state limit, wall or ceiling arm fit, and face size.
Best Well Pump (2026)
Which well pump fits your well: shallow jet, deep jet, submersible or constant pressure, sized from Red Lion tables, plus the switch, tank and control box.
Best Filtered Water Faucet (2026)
Filtered water faucets from maker documents: Moen Sip and Align 3-in-1, Delta Clarifi RO tap and KRAUS, with IAPMO-listed filter claims and install notes.
NSF Certified Water Filters (2026)
What NSF/ANSI 42, 53, 58, 401 and 55 certify, how to check a filter on NSF, WQA or IAPMO listings, and a listed pick for each filter type.
Best Water Pressure Regulator (PRV) for a House
Whole-house water pressure regulators compared from maker documents: when code needs one, setting it, thermal expansion, and Zurn, Watts and Cash Acme picks.
Best Heat Pump (Hybrid) Water Heaters
Heat pump (hybrid) water heaters compared from maker specs: Rinnai REHP50, REHP65 and REHP80 vs Senville, room size, drains, circuits and warranty terms.
Best Well Pump Pressure Switch (2026)
Well pump pressure switches from Square D, Merrill and Red Lion compared by setting, low-pressure cutoff, contact rating and what the makers say about install.
Best Faucet Water Filters (2026)
Faucet water filters from PUR, Brita and Culligan compared by NSF/ANSI listing, filter life in gallons, rated flow and the faucets they fit.
Best Handheld Shower Heads (2026)
Handheld shower heads compared by hose length, flow rating, backflow and warranty: Delta, Moen and Kohler, from the maker sheets and EPA WaterSense.
Rheem vs Bradford White Water Heater
Rheem vs Bradford White compared from maker documents: 50-gallon gas, electric and heat pump specs, warranty conditions, and where each one is sold.
Best RV Tankless Water Heater
RV tankless water heaters from Suburban, Camplux, Furrion and Girard, with cutout sizes, 12 V draw, LP supply, freeze and install rules from the manuals.
The Best Tankless Water Heater Brands (Compared, 2026)
Rinnai, Navien, Rheem, Noritz, Takagi, A. O. Smith and electric brands compared from maker documents: recirculation, flow and warranty fine print.
Read more: The Best Tankless Water Heater Brands (Compared, 2026)
Best Propane Tankless Water Heater
Whole-house propane tankless water heaters from Rheem, Rinnai and Eccotemp, plus LP inlet pressure, conversion, venting and freeze rules from the manuals.
Navien vs Rinnai Tankless Water Heater
Navien NPE-A2 vs Rinnai SENSEI RX and RXP, compared from the maker manuals: flow, recirculation, vent, gas line, water limits and warranty rules.
Best Constant Pressure Well Pump Systems
What a constant pressure well system needs, and how Franklin, Grundfos and Goulds match motors, wire and tanks, plus one shallow-well pick.
Best Well Pressure Tank
Which well pressure tank to buy: Red Lion RL34A and RL20A sized by fixture count, with 20-gallon drawdown compared across Amtrol, Goulds and Flexcon.
Best Iron Filter for Well Water
Backwashing iron filters for well water compared by maker-stated iron, sulfur and manganese limits, pH range, and the backwash flow your pump must supply.
Best Whole House Reverse Osmosis System
Whole-house reverse osmosis needs a tank, a pump and a drain. See what the maker says about output, waste and pretreatment, and when under-sink RO wins.
Best Gas Tankless Water Heater: High-Efficiency Rheem Picks (2026)
Gas tankless water heaters compared by flow at your water temperature: Rheem RTGH condensing, RTG indoor and outdoor, plus gas line, vent and permit notes.
Read more: Best Gas Tankless Water Heater: High-Efficiency Rheem Picks (2026)
Best Water Softener for Well Water With Iron
Four softeners for well water compared by maker-stated iron limits, flow and pressure ranges, with sizing arithmetic that adds iron to hardness.
Best Submersible Well Pump for a House
4-inch submersible well pumps compared by flow at your pumping level: 2-wire vs 3-wire, 115 V vs 230 V, wire size tables, and when to call a well contractor.
Best Inline Refrigerator Water Filter
Inline fridge and ice maker filters compared by certified claims, gallons, replacement interval and fittings: EcoPure EPINL30 and Aqua-Pure AP717.
Best Hot Water Recirculating Pump
Hot water recirculating pumps for houses with no return line: Watts pump-at-the-heater vs APCOM under-sink, how each works, and what to check first.
Best Shallow Well Pump for a House
Shallow well jet pumps compared by real flow at your lift and pressure: Goulds J10S vs Red Lion RJS-PREM, the 25-foot limit, and install tips.
Best Powered Anode Rod for Water Heaters
Powered anode rods matched to your tank: which Corro-Protec model fits, what it fixes, the real warranty terms, and how the install goes. From a plumber.
Best Salt-Free Water Softener Systems
Salt-free water softeners reduce scale but do not soften. The two systems worth buying, the limits that rule them out, and descaler vs softener.
Best Whole House Water Filter for Well Water
Well water filter picks matched to your test: iron and manganese, a rotten-egg smell, no-cartridge backwash, or bacteria with UV. From a licensed plumber.
Best Water Pressure Booster Pump for a House
Water pressure booster pumps for a house, matched to your inlet pressure: a quiet Grundfos, an Aquastrong variable-speed and a simple Simer. From a licensed plumber.
Best Sediment Filter for Well Water
Sediment filters for well water by stage: a reusable spin-down for sand, a coarser screen for sandy wells, auto-flush, and a 5-micron Big Blue cartridge.
Best Under-Sink Water Heaters: Mini-Tank and Tankless
Compare under-sink mini-tank and tankless heaters by cabinet size, electrical supply and draw length, with verified GE, Ariston and EcoSmart details.
Read more: Best Under-Sink Water Heaters: Mini-Tank and Tankless
Best Well Pressure Gauges for the Pressure Tank
A well pressure gauge on the tank tee shows where your pump cuts in and out. Three lead-free 0–100 psi picks, and how to check it at a hose bib.
Water Heater T&P Valve Replacement: Which Size and Model?
How to match a water heater T&P relief valve: pressure setting, 3/4-inch threads, shank and probe length, with Watts 100XL and Cash Acme NCLX models decoded.
Read more: Water Heater T&P Valve Replacement: Which Size and Model?
PRV Replacement by Brand: Watts, Zurn Wilkins, Cash Acme
Replacing a pressure reducing valve: Watts N45B is discontinued (LFN45B replaces it), LF25AUB-Z3 ranges, Zurn 70XL models, Cash Acme EB45 SKUs decoded.
Read more: PRV Replacement by Brand: Watts, Zurn Wilkins, Cash Acme
Fleck 5600 vs 5600SXT: Which Valve Do You Have?
Fleck 5600 (dial timer, skipper wheel) vs 5600SXT (digital head, meter modes): how to tell them apart and which parts they share, from Pentair’s manuals.
Water Softener Resin: How Much for a 9×48, 10×54 or 12×52
How much resin a softener tank holds: Pentair fills a 9×48 with 1.0 cu ft, a 10×54 with 1.5 and a 12×52 with 2.0, and why the vessel is not filled to the top.
Read more: Water Softener Resin: How Much for a 9×48, 10×54 or 12×52
Amtrol Well Tank Model Numbers by Size (WX, CH, PL)
Amtrol well tank model numbers decoded: WX-202, CH-20 and PL-20 are the same 20-gallon size. Sizes, dimensions, pressure ratings and how to measure a tank.
Read more: Amtrol Well Tank Model Numbers by Size (WX, CH, PL)
Well Pressure Tank Size Chart: Drawdown by Model
Well pressure tank size chart: Amtrol’s drawdown for every Well-X-Trol at 30/50, 40/60 and 50/70, plus its quick sizing table by pump gpm and horsepower.
Well Pressure Switch 30/50 vs 40/60: Which to Use
30/50 vs 40/60 well pressure switch: what the numbers mean, the tank precharge each needs, drawdown from Amtrol’s chart, and when a pump can’t reach 60 psi.
Read more: Well Pressure Switch 30/50 vs 40/60: Which to Use
Flexible vs Rigid Anode Rod: Which Do You Need?
Flexible or rigid anode rod? Clearance, cutting to length, and why Bradford White ships segmented anodes on some tanks, from maker documents and listings.
Water Heater Thermocouple vs Thermopile vs Flame Sensor
Does your gas water heater use a thermocouple, thermopile or flame sensor? How to tell by the gas control, with Rheem, A. O. Smith and Bradford White documents.
Read more: Water Heater Thermocouple vs Thermopile vs Flame Sensor
240V vs 208V Water Heater Element: What Changes
A 240V element on 208V runs at about 75%: 4500 W becomes 3380 W, per Rheem. When to buy a 240V, 208V or 120V element, from Rheem and A. O. Smith documents.