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Williamson-Thermoflo

A long history and a record of reliability have made the Williamson and Thermoflo brand names well known in the heating and air conditioning industry. Today the two names comprise Williamson-Thermoflo, a division of WM Technologies, LLC, which offers a full line of rugged, dependable oil and gas fired cast iron boilers, oil fired furnaces and indirect-fired water heaters.

Sold through authorized plumbing, heating and HVAC distributors, products from Williamson-Thermoflo are used in numerous residential and light commercial applications throughout North America. Service is available through licensed plumbers, professional HVAC contractors and oil dealers.

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GWC – Gas Water Condensing Boiler

AFUE’s above 91%

PVC, CPVC, PP or stainless steel venting

Cast iron primary heat exchanger

Stainless steel condensing secondary heat exchanger

Sealed combustion or direct exhaust venting

Multiple pass heat exchanger

Control module with indicator lights

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GWA – Series 3 – Gas Water Atmospheric

38,000 to 233,000 Btuh Input

Natural or Propane

Factory tested

Easy service

One-piece access door

All controls in easy reach

Cast iron sections with built-in air separator

Insulated heavy-gauge steel jacket

Low water cut-off

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OWT – Oil-Fired Water Boiler Series 3

Efficiencies 86% – 87% AFUE

Enhanced control

Temperature limit control

LWCO Function

Thermal pre-purge function

Rear flue outlet

Top flue available with optional kit

Easy service

Swing-away burner door

Top access cleanout cover

Plug-in wiring harness

High efficiency oil burner

Solenoid valve

PSC motor

Solid state ignitor

Cast iron sections with built-in air separator

Insulated heavy-gauge steel jacket

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PMP – Packaged Multi-Position Oil Furnace

AFUE’s to 84.3%

Multi-position installation – Up flow (High Boy), Horizontal – left or right

Heat exchanger – Front flue, Heavy gauge stainless steel primary heat exchanger, Tube style aluminized steel secondary heat exchanger with removable baffles. Large front access clean-out secured with studs and nuts, Spring-loaded observation port with test port

Blower – Multi-speed direct drive, Slide-out blower/motor – easily removed for service

Cabinet – Appliance finish powder coat paint, Heavy gauge with “Seal-Tite” construction, Foil-faced insulation for hand-cool surface

Burner and controls – Factory-wired, PSC motor, Solid state ignitor

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GL – Glass Lined Water heaters

Inspection opening provides easy access to clean & inspect tank

2 inches of dense foam insulation, CFC free & environmentally safe

Adjustable leveling legs

Low off cycle losses

Pressure relief valve provided

Tank & coil are 100% air pressure/water tested

Factory installed sacrificial magnesium anode rod

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