Homebuilders and repair professionals who need steam boiler controllers can buy the parts at Grainger, eComfort.com and SupplyHouse.com, as of 2015. These three industrial parts suppliers carry a wide assortment of controllers deigned to work with boiler systems for homes and businesses.
Grainger carries controllers from many major manufacturers, and the company offers easy reordering for professionals who need to keep steam boiler controller parts on hand. Shoppers who buy from eComfort.com benefit from free ground shipping on many orders, and the company's website accepts both PayPal and Amazon Payments, as well as major credit cards. SupplyHouse.com carries individual components and entire steam boiler units for sale.