Burnham ESC Boilers

Burnham ESC Boiler Overview

The Burnham ESC (Enhanced Sealed Combustion) is a gas-fired cast iron boiler with an efficiency rating of 85% AFUE. It is a direct vent or induced draft unit, ideal for installations where chimney venting is not possible. The rear jacket panel is flat to enable flush installations, and a layer of insulation under the jacket prevents heat loss while reducing operating noise. The ESC uses the IQ Control System, which operates the entire boiler system to save energy and setup time and includes an optional touchscreen which displays settings and diagnostics in sentences instead of codes.

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Consumer Reviews of Burnham ESC


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #3 of 13 Burnham Boiler
  • 50% of customers recommended

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Burnham ESC Boiler Reviews


1.0 rating
Very Unsatisfied

Total trash. I should have spent a few more bucks and went with the German ones.

John Clifford


"All about the install"

5.0 rating
Very Satisfied

Had the boiler for 2 seasons now. It's a great boiler. The IQ system works great, it's quiet, and saves about 40% on gas over the old Weil-McLain we had. Remember: a boiler is part of a system. It must be installed as such. Any installer that simply moves the old, slides in the new, and calls it done is a total hack and should be fired on the spot. There are very special considerations to be made for some system types when used with a cast iron boiler; for example, radiant slab and cast iron radiators. These run at lower water temps. A cast iron boiler needs to maintain at least 140 degree water or the flue condensation will rot the boiler out in very short order. The ESC can run at slightly lower temps, such as 125-130 degree supply water. These days, most boilers are pretty great. Unfortunately, most failures are caused by incorrect installation, and the boiler gets blamed. My advice: do your homework. Learn how the system works. Read the installation manual and question the installer. It's your money! If you want the boiler to last 30 years, make darn sure it's actually installed the way the manufacturer specifies. Because if it's not, it's YOUR OWN FAULT. So many negative reviews. I know of 17 Burnham installs in my town, all done by the same installer, who actually does things right. It may cost a little more initially, but you won't have issues later. If those 17, 17 are still working perfectly. The oldest 3 units are 27 years old. Install, install, install. Don't blame the boiler just because you hired a moron.

D. Marq

Superior, WI

Other ESC Reviews

Comments regarding the ESC on HVAC forums are quite mixed, with a few comments on sites such as doityourself.com from homeowners complaining about cycling problems. Professionals seem to think the ESC is an average unit, with most saying that having the unit properly sized and installed is the most important thing.

ESC Warranty

The warranty for the Burnham ESC boiler is comprised of the following:

  • 1-year parts warranty
  • Lifetime heat exchanger warranty, prorated after 10 years
  • Lifetime nipple leakage warranty

An optional 5- or 10-year parts and limited labor warranty is available.

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