Your water heater is one of those appliances you don't think about—until you're standing in a cold shower wondering what happened. When it's time to replace yours, you'll face a key decision: stick with a traditional tank, or go tankless?
This guide cuts through the marketing and gives you the real information you need to make a smart choice for your home and budget.
In This Guide
Signs You Need a New Water Heater
Water heaters don't last forever. Here are the warning signs:
Age
Tank water heaters last 8-12 years. Tankless units can last 20+. If yours is approaching the end of its lifespan, plan ahead rather than waiting for a cold-shower emergency.
Rusty water
If hot water from your taps is rusty or discolored, the tank may be corroding from the inside. This often means replacement is needed soon.
Strange noises
Rumbling, popping, or banging sounds indicate sediment buildup at the bottom of the tank. This reduces efficiency and can lead to failure.
Leaking
Water around the base of the unit? That's an emergency. A small leak can become a flood quickly. Call a plumber immediately.
Not enough hot water
Running out of hot water faster than you used to? Sediment buildup reduces capacity, or the heating element may be failing.
Tank vs. Tankless: The Real Differences
Both types work well. The right choice depends on your hot water usage, space constraints, and budget.
Tank Water Heater
- Lower upfront cost
- Simpler installation
- Works with any home
- Consistent output
Best for: Budget-conscious, replacement scenarios, most homes
Tankless Water Heater
- Endless hot water
- 20+ year lifespan
- Space-saving design
- Lower operating costs
Best for: Large families, high usage, long-term investment
The honest truth: Tankless units cost more upfront, and the energy savings take years to recoup. If you're staying in your home long-term and use a lot of hot water, tankless makes sense. If budget is tight or you're selling soon, a quality tank unit is the practical choice.
How to Size Your Water Heater
Getting the right size matters. Too small and you'll run out of hot water. Too big and you're wasting energy.
Tank Water Heater Sizing
For tank units, size is measured in gallons. General guidelines:
- 1-2 people: 30-40 gallons
- 2-3 people: 40-50 gallons
- 3-4 people: 50-60 gallons
- 5+ people: 60-80 gallons (or tankless)
Tankless Water Heater Sizing
Tankless units are sized by flow rate (GPM) and temperature rise. We calculate how much hot water you need to use simultaneously, then match you with a unit that can deliver that flow at the right temperature.
For Seattle's cold incoming water (around 50°F), you typically need a larger unit than warmer climates. We'll size it correctly during our assessment.
Understanding Efficiency Ratings
Water heater efficiency is measured by Uniform Energy Factor (UEF). Higher is better—it means more of the energy goes into heating water, less is wasted.
Typical UEF ratings:
Standard gas tank: 0.58-0.65
High-efficiency gas tank: 0.65-0.70
Electric tank: 0.90-0.95
Tankless gas: 0.82-0.97
Heat pump (hybrid): 2.0-4.0
Don't get too hung up on efficiency numbers. The real question is total cost over the unit's lifetime—purchase price plus operating costs. We can help you compare options for your specific situation.
What It Actually Costs
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Need contractor input: These prices are industry averages for the Seattle area. We should update with your actual pricing or price ranges.
Here are typical costs for water heater installation in King County:
Typical Installation Costs
Prices vary based on unit brand, capacity, and installation complexity. Tankless conversions cost more because they often require gas line upgrades or electrical work.
The Installation Process
Here's what to expect:
Assessment
We evaluate your current setup, discuss your hot water needs, and recommend options. This can often be done over the phone or with photos.
Quote & Scheduling
We provide a detailed quote. Once approved, we order the unit and schedule installation—often within a few days.
Installation
Tank replacements typically take 2-4 hours. Tankless installations or conversions may take a full day. We handle disposal of the old unit.
Walkthrough
We test everything, show you how to adjust the temperature, and answer any questions. You'll have hot water before we leave.
Emergency replacements: Water heater failed? We offer same-day replacement service. Call us and we'll get you back in hot water as fast as possible.
Frequently Asked Questions
How long do water heaters last?
Tank water heaters typically last 8-12 years. Tankless units can last 20+ years with proper maintenance. Water quality affects lifespan—hard water areas may see shorter lifespans.
Can I install a water heater myself?
Water heater installation involves gas or high-voltage electrical work, plus proper venting. DIY installation can void warranties, create safety hazards, and may violate code. Professional installation is strongly recommended.
Should I get an expansion tank?
Many jurisdictions now require expansion tanks on tank water heaters. They absorb pressure from thermal expansion and protect your plumbing. We'll let you know if yours requires one.
What temperature should I set my water heater?
120°F is the recommended setting—hot enough for comfortable showers and dishwashing, while reducing scalding risk and energy waste. We'll set it correctly during installation.
Are there rebates available?
PSE offers rebates for high-efficiency water heaters, including heat pump models. Federal tax credits may also apply to certain units. We can help you understand what incentives are available.
Need a New Water Heater?
Free assessment. No-obligation quote. We'll help you choose the right water heater for your home and budget.