Hey, I have a 75 gallon Bradford White natural gas WH and have questions about my GRUNDFOS recirculating pump. It is a 20 year old (UP 15-18 SU) model. Is the best way to install these by tying into the return line on the bottom of the WH discharge/drain? At least I think that is the return line (must be)? Also, what is the longevity of these pumps? It takes about 1.5 minutes for hot water in the kitchen (farthest from WH). Would installing those new (plastic) instant hot valves under the farthest sinks upstairs and downstairs help circulate the hot water more? Also thinking about replacing this older pump with the new WATTS recirculating pump adding the valves as well.
Here is a PIC, is this the preferred method for placement of the recirculating pump? Kind of like this diagram?