SpecDirectory

Weil-McLain ULTRA-230vsWilliamson-Thermoflo FS-155-*

Side-by-side boiler comparison

Weil-McLain ULTRA-230

AFUE

94%

Fuel

Natural Gas, Propane Gas

Type

Boiler

Hot Water

Can integrate

Williamson-Thermoflo FS-155-*

AFUE

95%

Fuel

Natural Gas, Propane Gas

Type

Boiler

Hot Water

Can integrate

Key differences

Both models are closely matched on afue: 94.0 vs 95.0 %. The Williamson-Thermoflo FS-155-* is larger at 95 % versus 94 %.

Efficiency

SpecWeil-McLainWilliamson-Thermoflo
AFUE(%)9495
Fuel TypeNatural Gas, Propane GasNatural Gas, Propane Gas
Can Integrate Hot Water HeatingYesYes

Configuration

SpecWeil-McLainWilliamson-Thermoflo
Product TypeBoilerBoiler
Model NameULTRAFS-155-*
View ULTRA-230 specs →View FS-155-* specs →

More comparisons

A. O. Smith ACB-110*vs Weil-McLain ULTRA-230A. O. Smith ACB-150*vs Weil-McLain ULTRA-230A. O. Smith ACB-199*vs Weil-McLain ULTRA-230Bosch KBR 21-3vs Weil-McLain ULTRA-230