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Old 04-19-2017, 11:54 AM   #1
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Is a Hot Water Recirculator worth it????


So here's the deal. I'm on a well with a 220V submersible pump. I just this weekend installed a Hybrid Heat Pump Hot Water Heater!!!!!! It's working great. I also just last night insulated my hot water pipes in the basement with R-3.3 Rubber insulation (even the elbows and Tees).

A major issue that I've been having is the water faucets upstairs (furthest away) take a few minutes to bring hot water upstairs.

I found a WATTS Hot water recirculator pump for real cheap (40 bucks). I'm thinking of installing this on the hot water heater and running a it at some time span. My concern is that the cost to run the pump v.s. the benefit. Since I have a well running additional water will put a strain on my pump and well/septic versus the additional electrical cost to pump cold water back to my hot water heater.

In other words is it worth it or a negative ROI?

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Old 04-19-2017, 01:20 PM   #2
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Re: Is a Hot Water Recirculator worth it????


Of course it is going to generate a negative ROI. You will be heating more water for your convenience at the tap. Heating water is about the most expensive thing you do in your home. You may want to evaluate how your plumbing is set up. Often people run many feet of 3/4" pipe out of the hot water source which can take several seconds to change over. Insulation may help, but will have minimal affect on overall performance.

If you try to recirc cold water back into the small tank on a hybrid unit, it is going to run continually.

And lastly, at a $40 price tag, doesn't sound like a potable water recirc. pump.
Sounds more like the price of a very low end boiler circ pump.

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Old 04-19-2017, 01:41 PM   #3
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Re: Is a Hot Water Recirculator worth it????


Quote:
Originally Posted by Yodaman View Post
Of course it is going to generate a negative ROI. You will be heating more water for your convenience at the tap. Heating water is about the most expensive thing you do in your home. You may want to evaluate how your plumbing is set up. Often people run many feet of 3/4" pipe out of the hot water source which can take several seconds to change over. Insulation may help, but will have minimal affect on overall performance.

If you try to recirc cold water back into the small tank on a hybrid unit, it is going to run continually.

And lastly, at a $40 price tag, doesn't sound like a potable water recirc. pump.
Sounds more like the price of a very low end boiler circ pump.

.
It's a used watts regulator recirculator pump on ebay for $40.00. Yes I know they are more expensive in HD. But you are saying that the cost to pump that extra cold water will not outweigh the expense to heat it, considering I'm using a heat pump hw heater.
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Old 04-19-2017, 02:02 PM   #4
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Re: Is a Hot Water Recirculator worth it????


I remember a device that was on TOH. You added the recirculator pump under the bathroom sink that was initiated by pushing a button. The cold water in the hot water lines recirculates back through the cold water lines until it hits a certain temperature and then shuts off. I seemed like a good idea because you're only running the pump long enough so that you don't have wait for the hot water.
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Old 04-20-2017, 12:13 PM   #5
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Re: Is a Hot Water Recirculator worth it????


Here's the link of the TOH episode that I was referring to.
https://www.thisoldhouse.com/how-to/...rculation-pump
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Old 04-20-2017, 12:13 PM   #6
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Re: Is a Hot Water Recirculator worth it????


Based on what everyone was saying here I decided to leave it alone.

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