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Aprilaire

Aprilaire 600
Large Bypass Humidifier

Large bypass humidifier delivering 17 gallons per day with built-in bypass damper. Automatic digital control adjusts to outdoor temperature. The most popular Aprilaire humidifier for GTA homes — reliable, quiet, and easy to maintain.

No Drain Required
Annual Maintenance
Made in USA
Aprilaire 600 Large Bypass Humidifier
Specifications

Aprilaire 600 at a Glance

Large bypass design with built-in damper — Aprilaire's most popular humidifier. Reliable performance for homes that need serious humidity control all winter.

17 GPD
Daily Capacity
0.7 GPH
Evaporation Rate
4,000 sq ft
Coverage (Tight Home)
Bypass
Humidifier Type
24V
Electrical
1×/yr
Water Panel Change
Model: Aprilaire 600  ·  15⅜″W × 15¾″H × 10¼″D  ·  Automatic Digital Control  ·  Built-in Bypass Damper
How It Works

Simple, Effective Humidity

1
Sensor Reads
The automatic digital control monitors indoor humidity and outdoor temperature, triggering the humidifier only when needed.
2
Water Flows
Water flows from your home's supply line into the distribution tray, evenly coating Aprilaire's patented Water Panel evaporator. Excess water drains away, flushing minerals.
3
Air Absorbs
Dry air from the return duct passes through the moisture-laden Water Panel via the bypass damper, absorbing humidity naturally.
4
Whole-Home
Humidified air is distributed through your existing ductwork to every room — no portable units, no refilling, no maintenance headaches.
Benefits

Why Choose the Aprilaire 600?

Aprilaire Authorized

Built-in bypass damper eliminates the need for separate bypass ductwork. Right or left discharge for flexible installation on supply or return plenum.

Quiet Operation

Uses your existing furnace blower — no additional fan or motor. The 600 operates silently in the background while your furnace runs, adding moisture without any noise.

Set It & Forget It

Automatic digital control with outdoor temperature sensor adjusts humidity levels throughout the season — no manual tweaking required.

Healthier Air

Maintaining 40–60% relative humidity reduces airborne viruses, eases allergy and asthma symptoms, and prevents dry skin and bloody noses all winter.

Once-a-Year Maintenance

Replace the Water Panel once per heating season. Built-in drain flushes mineral buildup. No standing water inside the unit keeps air fresh and clean.

Protects Your Home

Dry air cracks hardwood floors, splits furniture, peels wallpaper, and loosens joints. A whole-home humidifier prevents thousands in damage every winter.

Buyer Guide

Is the Aprilaire 600 Right
for Your Home?

Your home is between 2,000 and 4,000 sq ft
The 600 is rated for tightly constructed homes up to 4,000 sq ft, average-construction homes up to 2,000 sq ft, and loosely sealed homes up to 1,000 sq ft. For larger homes, consider the fan-powered Aprilaire 720.
You have a forced-air furnace with accessible ductwork
Bypass humidifiers mount directly on your supply or return plenum. They work with your existing furnace blower — no extra fan needed, no extra electricity.
You want automatic "set it and forget it" control
The included Model 60 digital control monitors indoor humidity and outdoor temperature automatically. Set your target once — the humidifier handles the rest all season.

Not sure which humidifier fits your home? Our technicians will assess your ductwork, home size, and climate needs — no charge.

Book a Free Assessment
Why H&C

The GTA's Trusted
Indoor Air Quality Experts

Licensed & Insured
Every technician is fully licensed and insured — we take pride in every job.
17+ Years Experience
Family-run business serving the GTA with integrity and expertise since 2008.
24/7 Emergency
We answer the phone 365 days a year. Your comfort is our priority.
5-Star Rated
Consistently rated 5 stars on Google by real GTA homeowners.
Free Home Assessment
We assess your home, measure humidity, and recommend the right unit — no pressure, no cost.
Aprilaire Authorized
Authorized Aprilaire dealer — professional install required for full warranty coverage.
FAQ

Humidifier
Questions, Answered.

Have a question that's not here? Call us — our technicians are happy to help.

1-855-539-4328
What is a bypass humidifier?
A bypass humidifier connects between the supply and return air ducts of your furnace. It uses the pressure difference created by your furnace blower to push dry air through a moisture-laden Water Panel. The humidified air then returns to the ductwork and is distributed throughout your home. Because it relies on your furnace fan, it uses no additional electricity and operates silently.
How big of a home can the Aprilaire 600 handle?
The Aprilaire 600 is rated for tightly constructed homes up to 4,000 sq ft, average-construction homes up to 2,000 sq ft, and loosely sealed homes up to 1,000 sq ft. Most GTA homes built after 2010 qualify as tightly constructed. If your home is larger, the fan-powered Aprilaire 720 is a better fit.
How often does the Water Panel need to be replaced?
Once per heating season for most homes. If you have very hard water, you may want to replace it mid-season. The digital control includes a service indicator that reminds you when it's time. The Water Panel (Model 35) slides out in seconds — no tools needed. One panel comes included with the unit.
Does it need a floor drain?
Yes. The Aprilaire 600 is a drain-through design — excess water that doesn't evaporate drains away to flush minerals and prevent buildup. A floor drain or condensate pump is required. The advantage is no standing water inside the unit, which means fresh, clean humidified air and no mold risk.
Should I connect it to hot or cold water?
Aprilaire recommends connecting to hot water when possible. Hot water increases the evaporation rate and complements the heat from your furnace. The unit works with cold, hard, or soft water too — but hot water gives the best performance.
What humidity level should I set?
The ideal range is 35–45% relative humidity in winter. The automatic digital control adjusts based on outdoor temperature — when it's very cold outside, it lowers the target slightly to prevent condensation on windows. Most GTA homeowners set the target around 40% and let the automatic control handle the rest.
What Homeowners Are Saying

Real Reviews from Real Customers

Terry Banfield
Google Review
★★★★★

"I had the pleasure of working with H&C Heating and cooling over the weekend. His attention to detail along with the care he shows to clients and contractors is amazing. Hands down H&C Heating and cooling will be go too for anything HVAC related."

Verified Google Review
William Kakish
Google Review
★★★★★

"Good service when you need them they're here fast good prices Pleasant people I would call them anytime"

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Michael Tomas
Google Review
★★★★★

"I had an excellent experience with Farshid at H&C. From the initial call and showing up to my place within 30 minutes to the completion of the service, their team was professional, responsive, and extremely knowledgeable. They arrived on time, explained the issue clearly, and walked me through the options without any pressure. The technicians were courteous, respectful of my home. I highly recommend H&C Heating and Cooling to anyone looking for dependable HVAC service. It's refreshing to work with a company that truly values customer satisfaction."

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Minoo GM
Google Review
★★★★★

"Professional, timely and efficient service. I would highly recommend using this company. Exceeds expectation."

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Get Your Free
Humidifier Quote

Fill out the form — or call us directly at 1-855-539-4328. Our team will reach out within 2 hours with a free, no-obligation estimate.

Same-Day Quotes
Fast response across the GTA
No Obligation
Free estimate with no hidden fees
Licensed Technicians
Required for Aprilaire warranty coverage