Between 2014 and 2015, the Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers industry saw employment growth of only 2.95%. There are an average of 11 workers at each of the 8,099 establishments in the United States. On average over the last five years, the Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers industry has a slightly higher OSHA reported accident rate (24% more) than the broader Hardware and Plumbing and Heating Equipment and Supplies Merchant Wholesalers Industry