(800)865-5931 Mon-Fri 7am-7pm, Sat 9am-2pm CT
EST. 2002
Home Air Products™
Free Shipping See Details
No Sales Tax See Details
Enter your zip for personalized product and service recommendations.
Actual product may vary from photos.

Crown Boiler Company TWZ075

91,000 BTU, Water Boiler, 85.8% Efficiency, Oil Fired, Tankless Coil for Domestic Hot Water


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
.75 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
79000 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)
86.1 %
ENERGY STAR® Qualified

Products earn the ENERGY STAR label by meeting the energy efficiency requirements set forth in ENERGY STAR specifications. The EPA establishes these specifications based on the following set of principles:

  • Product categories must contribute significant energy savings nationwide.
  • Qualified products must deliver the features and performance demanded by consumers, in addition to increased energy efficiency.
  • If the qualified product costs more than a conventional, less-efficient counterpart, purchasers will recover their investment in increased energy efficiency through utility bill savings, within a reasonable period of time.
  • Energy efficiency can be achieved through broadly available, non-proprietary technologies offered by multiple manufacturers.
  • Product energy consumption and performance can be measured and verified with testing.
  • Labeling would effectively differentiate products and be visible for purchasers.

ENERGY STAR® Qualified
Piping Connections - Water
1 1/2 Inch(es)
Min. Recommended Chimney Size
8 x 8 x 15 Dia(in) Ht(ft)
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