Equipment
- Wall Furnace NG 25,000 BTU Top Vent
The starting situation
A Newark homeowner had a wall furnace original to the house that was no longer keeping the space comfortable through cold mornings. Wall furnaces are common in older Bay Area homes, single-room heaters that bolt into a stud bay, vent through the roof, and pull combustion air from the room. When they’re old enough, the heat exchanger gets thin, the pilot/ignition system starts misbehaving, and most importantly: the gas-side safety devices on a 30-year-old unit don’t meet current code if anything ever needs to be replaced. The customer wanted a clean replacement, not a repair.
What we installed
- Williams Cosy wall furnace, 25,000 BTU, top-vent natural gas: sized for the room volume the unit serves
- New gas shutoff valve at the unit (the original valve was the old-style globe valve; current code requires an accessible quarter-turn ball valve)
- Vent connector refit for proper draft alignment with the new unit’s specifications
- Thermostat controls calibrated to the new ignition logic
The detail that mattered
Wall furnace installations look simple, pull the old one out, drop the new one in, but the part that catches DIY-minded homeowners off-guard is the gas-side work. The shutoff valve, the gas line connection, the leak test, the venting requirements: every piece is a code-and-safety item. We do the gas connection with a new shutoff valve, soap-test every joint, and verify draft on the venting side before we close anything up. This is the kind of work where a leak you missed shows up six months later as a CO problem or worse.
What the homeowner got
New wall furnace running quiet, reliable ignition on cold mornings, thermostat controlling cleanly. The gas-side safety updates bring the install up to current code, so any future service on this unit doesn’t trigger a “the shutoff valve has to be replaced first” delay. Equipment covered under our 10-year parts and 10-year labor warranty plus Williams Furnace Company factory warranty on the unit.
The photos below show the installation in progress and the finished wall heater mounted and operational.
After
