How much does a water heater cost?

Tank (gas): $800-$2,000 installed. Tank (electric): $700-$1,500 installed. Tankless (gas): $2,500-$5,000 installed. Heat pump: $2,000-$4,000 installed. The average homeowner spends $1,200-$1,800 for a standard 50-gallon gas tank water heater replacement (including installation). Switching from tank to tankless adds $1,000-$3,000 due to gas line and venting modifications.

Tank vs tankless water heater: which is better?

Tank: better if you want lower upfront cost ($800-$2,000 vs $2,500-$5,000), simple replacement, and proven technology. Tankless: better if you want endless hot water, energy savings (20-30% less energy), longer lifespan (20+ years vs 8-12 years), and space savings. Long-term cost: tankless saves $100-$200/year in energy but costs $1,000-$3,000 more upfront. Payback: 5-12 years. If you plan to stay in the home 10+ years: tankless is usually the better investment. If selling soon: a new tank heater provides adequate value at lower cost.

How long does a water heater last?

Tank (gas): 8-12 years. Tank (electric): 10-15 years. Tankless (gas): 20+ years. Tankless (electric): 15-20 years. Heat pump: 12-15 years. Signs of failure: rusty water, rumbling noises, leaks around the base, inconsistent hot water, and age over 10 years. The anode rod (sacrificial rod that prevents tank corrosion) should be replaced every 3-5 years to extend tank life. Most homeowners never do this, which shortens tank lifespan by 3-5 years.

What size water heater do I need?

Tank: 1-2 people: 30-40 gallons. 3-4 people: 40-50 gallons. 5+ people: 50-80 gallons. More important than tank size: the first hour rating (FHR). This measures how many gallons the heater delivers in the first hour of heavy use. A busy morning with showers, dishwasher, and laundry needs 60-80 gallon FHR. Tankless: measure by flow rate (GPM). One shower: 2-3 GPM. Two simultaneous showers: 5-6 GPM. Whole house: 7-10 GPM. For cold climates: size up because the incoming water is colder (requires more heating).

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Home Improvement

Water Heater Guide: Types, Cost & Sizing

Lumberama Editorial Team, Plumbing & Water Heater Specialists Sep 18, 2026 12 min read

Water Heater Types

Tank (storage): The most common type. Stores 30-80 gallons of hot water. Heats continuously (standby heat loss). Gas or electric. Cost: $800-$2,000 installed. Lifespan: 8-12 years. Pros: low upfront cost, simple technology, works during power outages (gas). Cons: standby energy loss, runs out of hot water, large footprint.

Tankless (on-demand): Heats water only when needed. No storage tank. Gas or electric. Cost: $2,000-$5,000 installed. Lifespan: 20+ years. Pros: endless hot water, energy efficient (no standby loss), compact, and long lifespan. Cons: higher upfront cost, may need gas line or electrical upgrade, flow rate limited (cannot run 3 showers simultaneously without a large unit).

Heat pump (hybrid): Uses electricity to move heat from air to water (like a reverse AC). 2-3x more efficient than standard electric. Cost: $2,000-$4,000 installed. Lifespan: 12-15 years. Pros: most energy efficient tank option, qualifies for tax credits. Cons: needs warm air (works best in 40-90 degree F spaces), taller than standard tanks, and slower recovery.

Solar: Uses rooftop solar collectors to heat water. Backup system for cloudy days. Cost: $3,000-$8,000 installed. Pros: lowest operating cost, uses renewable energy. Cons: highest upfront cost, depends on climate and sun exposure.

Point-of-use: Small tankless units installed at individual fixtures. Cost: $200-$500 each. Good for: remote bathrooms or kitchens far from the main water heater.

Sizing

Tank water heaters (by household): 1-2 people: 30-40 gallons. 3-4 people: 40-50 gallons. 5+ people: 50-80 gallons.

Tankless water heaters (by flow rate): 1 shower: 2-3 GPM. 2 showers: 4-6 GPM. Whole house: 6-10 GPM.

First hour rating (FHR): How many gallons of hot water a tank delivers in the first hour. This matters more than tank size. A busy morning (showers + dishwasher + laundry): needs 60-80 gallon FHR.

Gas vs Electric

Gas: Faster recovery (heats water quicker). Lower operating cost (in most areas). Requires venting. Works during power outages.

Electric: Lower upfront cost. No venting needed. Safer (no combustion). Higher operating cost (in most areas).

Heat pump electric: Lowest operating cost of any type. Uses 60-70% less electricity than standard electric.

Costs

Purchase + installation: Tank (gas): $800-$2,000. Tank (electric): $700-$1,500. Tankless (gas): $2,500-$5,000. Tankless (electric): $1,500-$3,000. Heat pump: $2,000-$4,000. Solar: $3,000-$8,000.

Annual operating cost: Gas tank: $250-$400. Electric tank: $400-$600. Tankless gas: $150-$300. Heat pump: $100-$250.

Tax credits: Heat pump water heaters qualify for federal tax credits up to $2,000.

Installation extras: Gas line extension: $200-$800. Electrical upgrade: $200-$500. Expansion tank: $40-$150. Permit: $50-$200.