AB 55k-2 Swimming Pool Heat Exchanger 55kBtu 316L Stainless Steel Opposite 1 1/2" & 1" FPT for Spa/Solar/Swimming Pool Heat Exchanger

I'm using this heat exchanger to heat my 6000 gallon pool. I've combined it with a heat pump water heater (which heats our hot water while cooling the house) and had a plumber do a pumped hot water circuit through the heat exchanger that I control with a smart plug. I piped the pumped pool water to the unit before it goes back to the pool. I've been able to raise my pool about 1.3 degrees per hour, but I'm limited by my hot water tank (on heat pump mode) as I only have the heat exchanger running 15 minutes out of 75 minutes so as not to run out of hot water.So I'm sucking heat out of my house and dumping it into my pool and this unit is doing its job perfectly as expected.Note - the silver unit above is a UV sterilizer.. Water goes through that prior to going to the heat exchanger.

We installed this in a pool that has underground heating generated by solar hot water panels (Central America - plenty of sun!). We needed a little bit more heat and so added this heat exchanger into the system. The build quality is good and heat transfer exactly as rated. It has added several degrees to the pool temperature as planned and in turn returns cooler water to the panels, which in turn makes them more efficient. Very happy with the buy.

We used this for our pool heater and let me tell you, this works amazing! It doesn’t leak, was easy to install and it works efficiently to warm up the pool!!!

With me having a radiant heat system , I installed 2 of these in series on my indirect water tank. The outdoor wood boiler, and they accomplished well beyond my expectation. I got these because of the well water, I did not want to use the plate heat exchangers for fear of them getting blocked with sediment from the well. they were well worth the price

I'm using this heat exchanger as coolant cooler on my diesel irrigation pump, in addition to the radiator. It works perfect! before it was running about 230F now it runs about 160F. I use the irrigation water, to cool the coolant. A real Quality product!

Easily heating our pool with our outdoor furnace with easy. This thing is compact yet powerful.

The product we got was different then the picture! Still works but we had to redo the plumbing!

I selected this to be oversized for my application. I am using it as the heat exchanger in an indirect hot water heater, meaning that a loop from the boiler system heats domestic hot water, separated by this heat exchanger. External thermostats will control the two loops. I decided not to use natural convection on the domestic hot water side, flow will be forced by a ( wet rotor ) pump.Contrary to the directions that come with the heat exchanger, I am running the feed water ( heat supply ) through the shell. The boiler loop is closed, so scale buildup will be minimal. The domestic hot water ( heated side ) of the heat exchanger will be through the tubes, which should be easier to clean in case of scale buildup.The heat exchanger looks good. We fabricate stainless steel ourselves, I did not make one because of time limitations. The unit is a good value compared to the time and material I would have had in making one.A few weeks of use will show if I need to make any changes to my application ( the way I am using it ).I bought a second, larger unit. Amazon reviews doesnt seem to separate the first purchase and the second.Review #2. I bought a 300k version from Amazon Warehouse. Uh, used does mean used. This one had been installed. There is some scale in the tubes. The tubes are stretched as if ( probably) very high pressure went through them.I am not sold on the spiral tube forming. I will do a mild pressure test on this, if it holds up I will use it.