Frequently Asked Questions

If you have questions, Weil-McLain has answers.

Whether you are a homeowner, a contractor or building trades professional, please consult our list of frequently asked questions.

If you do not find the information you need, please contact us using this form or call us at the appropriate contact number.

System Operation

 Can I use anti-freeze to protect my system?

Anti-freeze can be used with Weil-McLain® boilers. We recommend using an anti-freeze designed for hydronic systems and formulated with inhibited propylene glycol, a non-toxic antifreeze. A solution of up to 50% can be used. No compounds containing petroleum should ever be used in your heating system. Do not use automotive anti-freeze.

 What are the proper temperature settings for my boiler?

The average setting for the aquastat (the temperature control device on a boiler) for a forced hot water system is 180°F. It can be raised as high as 210°F if needed in severe weather. For systems that use coils to heat domestic hot water, the high limit setting is 210°F and the low limit setting 140°F. A differential setting of 15°F is recommended for the optimum amount of domestic hot water.


General Product Information

 What size boiler is appropriate for my house or business?

Your local heating professional should perform a heat-loss estimate based upon the size and construction of your home before recommending a boiler size and model.

 Where can I buy Weil-McLain® products?

Weil-McLain does not sell direct to consumers. Our products are sold exclusively through our wholesale distributors to contractors.

If you are a heating contractor, contact your local wholesale distributor for pricing and availability. Use our Distributor Locator now.

If you are a homeowner, facility manager or building owner, contact licensed professional heating contractors for price quotes. Use our Contractor Locator now.

 How can I obtain Weil-McLain® product manuals?

Most current product manuals are available from this web site on the respective product pages and from the Resources section. However, if your manual is not listed in our electronic index, please contact us to request a copy.

 What are the MEA numbers for Weil-McLain® products?

Here is a list of MEA numbers for current and discontinued Weil-McLain® boiler models. For more information about MEA numbers, contact the technical services help desk. Call 219-879-6561 ext. 600 or email wmtechnicalservices@weil-mclain.com.


Problems and Troubleshooting

 What should I do if my heating system is not working correctly?

Please contact your local heating professional to troubleshoot your system. Your heating professional can contact a Weil-McLain distributor or our technical service department for additional assistance.

 How can I get an expert from Weil-McLain to troubleshoot my boiler?

Weil-McLain does not employ heating technicians who come out to repair your boiler, nor do we have factory-authorized servicers. We rely upon independent heating professionals in your area to install, maintain and troubleshoot Weil-McLain® products. Please contact a heating professional in your area. If needed, your heating contractor can contact our area office or our technical service department for assistance with trouble-shooting problems.

 I installed my own boiler. How do I get technical support?

If you are a homeowner who installed your own boiler and are not a professional heating contractor, you must contact the distributor/dealer who sold you the boiler for technical support and warranty action.


Warranty Procedures

 How do I file a warranty claim?

Your professional heating contractor should return warranty items to your local area wholesale distributor for credit. Weil-McLain does not accept warranty items directly from consumers or heating contractors.

 Who do I call if my boiler is leaking?

If your boiler is leaking, contact your installer or a professional heating contractor of your choice. Use our contractor locator for a list of contractors in your area. If the unit needs to be replaced immediately, your heating contractor should obtain the appropriate cast iron section block or boiler from a local wholesale distributor.

Warranties are not approved sight unseen, and field representatives cannot make any type of warranty determination while the boiler is still installed.

For warranty consideration, the leaking boiler or section block should be returned to the same wholesale distributor where the replacement was purchased. Our field representative will then do a thorough inspection of the product at the wholesale distributor. At that time, claim credit or denial will be processed based on the findings. Credits for warranties are processed through the wholesale distributor; Weil-McLain does not reimburse consumers directly.

 How do I clean a steam boiler?

To clean a steam boiler, a heating professional can:

Use one pound of trisodium phosphate for every 50 gallons of water content.

Heat the boiler to 180°F; hold at 180°F for two hours.

Do not allow the boiler to make steam.

After two hours, drain the boiler and fill with fresh makeup water. Water treatment chemicals should be reviewed before they are introduced into the boiler. Foaming agents that will interfere with steam action are of particular concern. Sodium carbonate (up to one pound for every 30 gallons) or sodium hydroxide (lye) (up to one pound for every 50 gallons) may be used.

Check pH level after cleaning. It should be between 7 and 8.5. A small amount of cleaner may be added to adjust the pH up to the proper range.

DO NOT use petroleum-based products in the boiler.

 How do I clean a cast iron hot water boiler?

To clean a cast iron boiler, a heating professional can:

Use one pound of trisodium phosphate for every 50 gallons of water content.

Fill, vent and circulate the system with above mixture, allowing it to reach design or operating temperature if possible.

After circulating a few hours, drain the system completely and refill with fresh water. Usually, enough of the cleaner will adhere to the piping to give an alkaline solution satisfactory for operation: a pH reading between 7 and 8.5. Sodium carbonate (up to one pound for every 30 gallons of water content) or sodium hydroxide (lye) (up to one pound for every 50 gallons) may be used.

Check pH level after cleaning. It should be between 7 and 8.5. A small amount of cleaner maybe added to adjust the pH up to the proper range.

DO NOT use petroleum-based products in the boiler.