Grundfos Booster Pump

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Grundfos Booster Pump
– A Review

Whole House Hot Water Recirculating System

grundfos booster pumpA booster pump or whole house hot water recirculating system is a nonsubmersible pump designed to bring hot water to your kitchen and bathroom faucets without having to run and waste water for several seconds waiting for it to get warm. How well a water circulation pump depends on many factors of your household; size of hot water heater, pipe length, distance of pipes from hot-water heater, and last but not least, temperature and climate. Before I had a Grundfos circulation pump, it required over a minute for the water coming out of my kitchen faucet to get warm first thing in the morning. I was constantly filling pots as the water ran, as to not waste so much water. I had heard about hot water recirculating systems before, so when I had a new hot water heater installed last summer I decided to finally give one a try.

Grundfos Nonsubmersiable Circulation Pump

The Grundfos circulation pump pictured above costs around $275.00 by itself, or $400 – $550 professionally installed. I paid around $525.00 to have it installed with my hot-water heater.   You can keep the timer set to off if you would prefer the pump to be on 24-7. The unit is often named a Grundfos Comfort System and sold as a kit which I will explain below:

Grundfos Booster Pump Kit

hot water recirculating systemThe Grundfos pump kit or pretty much any whole-house-hot-water-recirculating system consists of two hardware pieces: Booster pump with built-in, 24-hour timer; 3-prong electrical power cord, and a hot-cold water union.  The Grundfos booster pump is installed by the hot water heater, itself. The additional union hardware (known as a comfort valve) is installed between the hot and cold water outputs and faucet fittings of the sink which is farthest away from your hot water heater. The reason for this fitting is to make hot water instantly available at all fixtures. You can see a more detailed, specific explanation here: Grundfos Circulation Pump.  This all sounds good in theory, but how well does it work? I’ll give you the results of my own experience over the last year.



How well does a Hot Water Recirculating System Work?


My hope was that the Grundfos hot water recirculating system would get hot water to all fixtures of my house instantly. My biggest desire and need was to get instant hot-water from the kitchen faucet in the mornings. After the Grundfos booster pump was installed, I was still not getting instant hot water to the kitchen sink. My time was reduced from 1:20 seconds in the morning to about 35 seconds. This is a big improvement, but hardly instant. The one place I do get instant hot water is my bathroom sink where the union comfort valve was installed. Here-in lies my biggest complaint with the whole system. I am no longer able to get cold drinking water from my bathroom sink without running the water for about 20-30 seconds. This sort of defeats the entire purpose of a hot water circulation system, doesn’t it? When weighing the pros and cons of getting instant hot water to my bathroom sink versus still not getting instant water to the kitchen sink versus having to waste water to get cold drinking water from my bathroom sink, I would not buy a Grundfos Booster Pump or water circulation pump if I had to do it all over again. A plumber informed me that I could swap the comfort valve union with another upstairs sink in the house, but I would only be trading problems with another household member. To tell you the truth, I am torn between removing the entire system or leaving it as is. I did give the Grundfos comfort system one-star because I can see how it might work better for some households with different plumbing systems.  If you own a Grundfos booster pump like this please leave us your own rating based on your own experience. If you have another type or kind of hot water circulation system please leave your comments below.

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