When buying steel pipe from a distributor, the purchasing agent and salesperson should execute a formal quote and purchase order. 

The DOE is looking at heat pump water heaters in its effort to reduce greenhouse gases and dependence on fossil fuels.

Plumbing fixtures such as toilets and sinks must also undergo a rigorous testing regime to prove durability, performance and suitability for use. Accredited test labs ensure that products will perform as intended.