Aprilaire 800 Steam Whole-House Humidifier

Why it matters

The Aprilaire 800 Steam Whole-House Humidifier is a steam humidifier that mounts on the furnace or its ductwork, rated for homes up to 10300 square feet, with a stated output of 11.5 gallons per day.

A steam humidifier boils water in a canister and injects the steam into the ductwork, so it works even when the air from a heat pump is only lukewarm.

Whole-house humidifiers need a water supply line, a drain for bypass and fan-powered models, and a humidistat; the replacement water panel or canister is a yearly cost.

It qualifies for our list Best Whole-House Humidifiers, where it is ranked against every model that meets the same rule.

Compared with the Aprilaire 600 Whole-House Humidifier: rated room size 10300 square feet here vs 4000 square feet.

Who it's for, and who should skip it

Good fit if

Homes with forced-air heating
Dry winters across the whole house

Look elsewhere if

Homes without ductwork

Pros and cons

Pros

Rated for 10300 square feet
Output 11.5 gallons per day
Humidifies every room the ducts reach

Cons

Professional install for most homes
Yearly water panel or canister

Limitations to weigh

Not stated on the Aprilaire 800 Steam Whole-House Humidifier listing: power draw. Ask the seller or check the manual before relying on it.

Specifications

The bracket shows where each figure comes from.

Model number	800	Retailer
Room coverage	10300 square feet	Retailer
Filter type	Steam Canister	Retailer
Capacity	11.5 gallons per day	Retailer
Run time per fill	0 minute	Retailer