11/02/2026
🍂 The clocks fell back last weekend and the nights are getting cooler in LaPorte. Boilers are back to work.
Between heating cycles, a big old radiator system can cool all the way down to about 60°F, and that's the water the boiler has to warm back up.
If you're asking whether an old radiator system can hurt a new Weil-McLain CGi boiler, the answer is yes, if the water coming back to the boiler runs too cold, because that cold water makes flue gas condense inside it. Weil-McLain's manual says keeping the boiler's water warm enough prevents that condensation. It also warns that cold return water can corrode the boiler's cast-iron sections.
So when we put a new CGi on a big old radiator system, the piping that keeps the water coming back to the boiler at 130°F or more is on our quote. Worth asking about on any boiler quote.
Call 219-362-6251. Mon–Fri 7AM–5PM, Sat 7:30AM–12PM. Hope you enjoyed the extra hour of sleep, neighbors. 🕰️
Photo: a Weil-McLain CGi Dye installed.
Dye Plumbing & Heating, LaPorte-based since 1939, serving LaPorte and Rolling Prairie. 4.8 stars on 466 Google reviews. Indiana Plumbing Contractor License PC #10500518.