Your #1 fireplace source. Ontario Hearth Fireplaces is a specialty fireplaces and accessories dealer, located at 3600A Laird Road, Mississauga, Ontario, Canada. Established in 2002, Ontario Hearth Fireplaces is pleased to assist you with all your fireplace needs. Our Showroom. You've got to see it. With over 8000 square feet, our showroom is a true fireplace design centre as it features over 35 of the latest models on the market today. We are consistently upgrading our showroom, so whether you are building a new home, renovating, or re-modeling, Ontario Hearth's showroom is where you need to be. Pride and integrity. We take great pride in our work, and want only the best quality for our customers. That's why at Ontario Hearth Fireplaces, we only use our licensed technicians to ensure the proper setup of your fireplace, and that it meets our installation standards.