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3) Make sure that the boiler is correctly sized:
• For heating systems employing convection radiation (baseboard or radiators) use an industry accepted sizing
method such as the I=B=R Heat Loss Calculation Guide (Pub. #H21 or #H22) published by the Hydronics
Institute in Berkeley Heights, NJ.
• For new radiant heating systems refer to the radiant tubing manufacturer’s boiler sizing guidelines.
• For systems including a Crown Mega-Stor indirect water heater, size the boiler to have either the DOE
Heating Capacity required for the Mega-Stor or the net rating required for the heating system, whichever
results in the larger boiler.
• For systems that incorporate other indirect water heaters, refer to the indirect water heater manufacturer’s
instructions for boiler output requirements.
4) In some cases, boilers installed at altitudes above 2000ft may require a different burner configuration from that at sea
level. Consult the local Crown representative for more information.
IV Locating the Boiler
1) Clearances:
• Observe the minimum clearances shown below. Except as noted, these clearances apply to all combustible
construction, as well as noncombustible walls, ceilings and doors. Also see Figure 2.
Front – 24”
Left Side – 6”
Right Side – 6”
Rear – 6”
Top – 6”
Single Wall Chimney Connector (to combustible construction) - 18”
• A 24” service clearance from the jacket is recommended from the top of the boiler. This clearance may be
reduced to that shown above; however, servicing the boiler will become increasingly difficult as this clearance
is reduced.
2) If listed Type L vent is used, follow vent pipe manufacturer recommendations for minimum clearances.
3) Do not install this boiler directly on a combustible surface. Where it is desired to install the TWZ over a non-carpeted
combustible surface, install the boiler on the base shown in Figure 3.
4) Do not install this boiler in a location where gasoline or other flammable vapors or liquids will be stored or used. Do
not install this boiler in an area where large amounts of airborne dust will be present, such as a workshop.
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