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Crown Boiler Company TWZ100

120,000 BTU, Water Boiler, 84.3% Efficiency, Oil Fired, Tankless Coil for Domestic Hot Water


    • Shipping to Canada

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    • Pro Installation
The TWZ series boiler is a cast iron oil-fired water boiler designed for use in closed forced circulation heating systems. This boiler must be vented by natural draft into a lined masonry or metal chimney, or Type L vent. An adequate supply of air for combustion, ventilation and dilution of flue gases must be available in the boiler room. A factory installed tankless coil for domestic hot water is included with this boiler, eliminating the need for a domestic hot water heater. (Domestic water being that used for cooking, cleaning, and bathing.)

Please read this Important Safety Notice

Standard Features
  • High efficiency - to 85.8% AFUE
  • Two-tone powder coated jacket, resists scratching, insulated with fiberglass to minimize wasteful heat loss
  • Split top jacket panel easily removed for servicing
  • Higher capacities can be achieved by changing the nozzle size
  • Chimney vent
  • Wet base construction surrounds combustion area at top, bottom, rear and sides of boiler
  • Combustion chamber has a ceramic fiber target wall with floor blanket
  • Swing open burner door for easy service
  • Standard equipment includes: Oil solenoid valve, burner twist disconnect, flame retention oil burner with interrupted ignition, combination aquastat/relay, draft regulator, 1-1/2" circulator, combination temperature/pressure gauge, boiler drain valve, ASME relief valve
Effective Heating Capacity (BTUs)
Burner Capacity
1.00 GPH
Water Capacity
16 Gallons
Net Water Rating

The amount of heat, measured in BTUs, that the unit will be able to effectively deliver into your home.

Net Water Rating
104000 BTU
Efficiency (% AFUE)

The percentage of energy converted into output by the unit. The remaining percentage is lost during the conversion process. The higher the efficiency, the lower the operational cost.

Efficiency (% AFUE)
84.3 %
Piping Connections - Water
1 1/2 Inch(es)
Min. Recommended Chimney Size
8 x 8 x 15 Dia(in) Ht(ft)
Flue Size
6 inches
Product Weight
560 lbs
Meets CSA Standards

Canadian Standards Association

Meets CSA Standards
24 1/2 Inches
16 1/2 Inches
31 1/2 Inches
Cast Iron Sections Warranty
Parts Warranty
1 Years

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.