Free Free Free, but read this whole paragraph - Taco Circulator for water heater to create quicker hot water at home facets. Process described on Taco website. Requires lots of plumbing connections. I believe it needs a new cartridge which costs $220 +tax. Taco 006-ST4 1/40 hp 115 volt stainless steel. This does not include the timer module which shows in the picture of my installation. A new complete, working Taco 006-ST4 costs $400. A new cartridge, (Cartridge Assembly Complete: 005-020RP), costs around $220 +tax. Do the research to make sure you can use it.