Find the Best Tankless Water Heater for Your Home
We compare and rank gas, propane, and electric tankless water heaters on flow rate, efficiency, and real install cost — so you get endless hot water without the guesswork.
Latest Reviews & Guides
Tankless Water Heaters at SupplyHouse.com (2026): The Plumbing-Wholesaler Channel Big-Box Stores Skip
SupplyHouse.com sells Rheem, Rinnai, A.O. Smith, State, Eemax, and Takagi tankless water heaters at wholesaler pricing — but it doesn't carry Navien at all, and its 'no restocking fee' return policy works differently on a heavy unit than on a small part.
GuidesPrecisionTemp Tankless Water Heater Review 2026: RV-550 EC & TwinTemp-2
PrecisionTemp makes OEM tankless water heaters for high-end diesel pushers and marine applications — including the TwinTemp-2, which also heats the coach. Full spec breakdown, real prices, and current availability.
Best PicksBest Water Pressure Booster Pump for a Tankless Water Heater (2026)
If your tankless water heater runs weak even after a fresh inlet filter and a descale, the real fix might be upstream. We compare the two pump types that actually solve a low-incoming-pressure problem: a smart all-in-one booster and a traditional motor-and-tank system.
Buying GuidesTankless Water Heater Retrofit: What Actually Changes When You Convert From a Tank (2026)
The three things a tank-to-tankless retrofit changes that a straight swap doesn't — venting you can't just tie into the old flue, the gas-line question manufacturers and independent plumbers answer differently, and why the unit hangs on a wall instead of sitting on your floor.
Buying GuidesWhy Does My Tankless Water Heater Smell Like Gas? (2026)
A faint whiff at startup, a rotten-egg smell only in hot water, or a lingering gas odor with the unit off all mean different things — and only one of them means leave the house and call the gas company. Here's how to tell them apart.
Buying GuidesTankless Water Heater Financing: The 0% Offer That Isn't Really 0% (2026)
Home Depot's Project Loan, Lowe's Advantage Card, and plumber-pitched Wisetack plans can spread a $1,400-$5,600 tankless install into monthly payments — but the most common promo, deferred interest, charges you for every month retroactively if you miss the payoff date by even a dollar.
Why Trust TanklessHeaterLab?
Spec-Driven Reviews
We rank on measured GPM flow rate, UEF efficiency, and real-world install cost — not marketing claims.
Tankless Specialists
Gas, propane, condensing, and electric on-demand units — we know Rinnai from Rheem and UEF from GPM.
Every Budget
From under-$200 point-of-use electric units to premium condensing whole-home systems — clearly labelled.
Updated for 2026
Prices, picks, efficiency ratings, and tax-credit notes kept current.