A furnace heats air and pushes it through ducts; a boiler heats water and circulates it through radiators, baseboards, or in-floor loops. Furnaces respond fast and share ducts with cooling; boilers deliver quiet, even, dust-free heat. Neither is 'better' — they suit different homes, and the right move is usually to service and upgrade the type your home was built around.
Which one is right for your home?
If your home has ductwork, a furnace (or a heat pump using the same ducts) is almost always the practical choice. If your home has hydronic heat — radiators, baseboards, or radiant floors — a modern condensing boiler is usually the right upgrade path, because converting a hydronic home to forced air means installing ductwork from scratch.
What fails on each system?
Furnace failure modes are mostly airflow and ignition: plugged filters, failed blower motors, flame-sensor faults. Boiler failure modes are mostly water-side: circulator pumps, pressure loss, airlocked loops, and scale in older heat exchangers. Both benefit enormously from annual service, but boilers especially — a small leak or pressure drift caught early prevents a much bigger repair.
Can you add cooling to a boiler home?
Yes — this is one of the most common questions we get in older Fraser Valley homes with hydronic heat. Ductless mini-splits add cooling (and backup heat) room by room without touching the boiler system, which keeps doing what it does best in winter.
Big Valley services furnaces, boilers, and hydronic systems across the Fraser Valley — we've worked on both sides of this comparison since 1986, including the sheet-metal side when ductwork does enter the picture.
Ask Us About Your System
Tell us what's in your mechanical room and we'll give you a straight answer.