Boiler Replacement: What to Expect in an Older Des Moines Home

By the connected radiation — the heat your radiators and loops can actually emit — plus a heat-loss calculation. Old boilers were routinely oversized, and copying that size wastes the modern equipment's efficiency. This survey step is where hydronic experience shows; boilers are a specialty, and it's fair to ask any bidder how many they install a year.

High-efficiency condensing boilers extract extra heat from exhaust and modulate output — excellent fuel economy, PVC venting, and they thrive on the lower water temperatures radiant floors use. Cast-iron/standard boilers cost less, tolerate older high-temperature radiator loops, and have famously long service lives. The honest answer depends on your emitters, venting options, and how long you'll own the home — there are legitimate cases for each.

• Circulators and zone valves — replaced or verified; a new boiler behind a failing pump is a callback waiting to happen.
• Expansion tank and air elimination — matched to the new system's volume.
• Loop flush — decades of sediment shouldn't circulate through a new heat exchanger.
• Venting — condensing conversions need new intake/exhaust; an orphaned water heater on the old chimney may need attention.
• Permits and inspection — mechanical permits apply metro-wide; included in any legitimate quote.