Water Heater Guides, Costs, Sizing & Installation
Choose a system that fits your home.
Understand the budget. Prepare for the work.
Independent guides for domestic hot water: tank, tankless, heat pump, gas, electric, and point-of-use systems. Start with the decision in front of you.
Make a decision
A practical first pathChoose the best water heater for your home
Choose a water heater for your constraints: recovery, installation, energy use, service and budget. A use-case shortlist without universal rankings.
Read guide CostsWhat does a water heater really cost?
Build a water heater budget by type, installation scope, running cost and verified incentives. See transparent planning ranges and a quote checklist.
Read guide InstallationPlan a water heater installation that fits your home
Plan a residential water heater installation with site checks, sizing, plumbing, electrical, venting and commissioning questions for your contractor.
Read guideChoose your water heater
Storage style, fuel, and heating technology overlap. An electric heater can be a conventional tank or a heat-pump model; a gas heater can store water or heat it on demand.
Compare system tradeoffs and check peak hot-water demand before comparing equipment prices.
Solve a hot-water problem
Start with no hot water, a leaking heater, or the repair decision guide. Compare diagnosis and repair cost with replacement options. Gas odors, combustion problems, flooding near electricity, and uncontrolled hot-water discharge need urgent professional help.
Use the planning tools
Estimate a budget, check peak demand, calculate tankless flow at your temperature rise, or search our limited verified incentive records.
Water heater cost calculator
Estimate a domestic water-heater budget with equipment, labor, permit, removal, and complexity allowances. Compare clear assumptions before requesting quotes.
Open calculator ToolsWater heater size calculator
Estimate your busiest hour of domestic hot-water use from showers and appliances. See a tank-volume starting band and a first-hour-rating discussion target.
Open calculator ToolsTankless GPM calculator
Add simultaneous fixture flow and calculate temperature rise plus water-side heat demand. Compare tankless performance at your cold-season inlet temperature.
Open calculator ToolsWater heater rebate finder
Find reviewed water-heater incentive records and official state or utility lookup resources. See known dates, equipment rules, and unknown eligibility clearly.
Open calculatorAll water heater guides
Explore the referenceBuying & planning
9 guidesEvidence before recommendations.
We explain assumptions, link to source material, and distinguish installation allowances from local quotes. Read our methodology and editorial policy. WaterHeaters.wiki covers domestic hot water, including heat-pump water heaters. Space heating and cooling belong to the separate HeatPumps.wiki reference.