UCEDER Hot Tub LX H20-Rs1 Thermostat 110V 2kw with Adjustable Temperature Thermostat for Some hot tubs,Underground Small Pool &Bathtub（Suggest Connect 20A Adapter or Breaker

I bought this for my 8' stock tank pool to make it a hot tub during the winter. I read other mixed reviews that had also bought it for converting a stock tank pool to a hot tub. I gave it a try because I didn't want to setup a propane instant hot water tank setup. It did take a couple trips to the local hardware store to get all the proper fittings but I got it all connected and up and running. I did run into the same problem at first of the heater not kicking on so I tried taking the top cover off like others said they did and I tricked the switch to be on. Also I did have to plug it into a 20 amp plug. While I was trying different things, I had changed the filter on the Intex 1500 filter pump and noticed the flow switch was working like it should so I put it back together with no modifications and it works great, I just change the filter every 2 to 3 weeks and have no issues. I did also buy a Bayite temperature controller plug and plugged the filter pump into it on the heat plug and have the temp set to turn off at 100° and have it kick back on at 98°. I did have to change the plug on the Intex filter pump to a non GFI plug because every time the temperature control plug shut off when it reached 100° the GFI plug on the pump would pop off. I have had no issues in 2 months now and am loving it. It did take a few days to get up to temp, I live in the foothills of California and the temp here recently has been in the high 50's to low 60's during the day and mid to high 30's overnight and it keeps it to temp with no problems. I have a blue bubble cover and a black 8' pool cover on it to help keep in the heat.

This thing is great but it’s not made for small pools so you’ll need to be crafty. I have mine connected to a 10x30 pool and is heated to 84-88 degrees. First it’s meant to be hardwired for 20amps but I put a 15amp plug on it which is plugged in to a 15amp GFCI outlet and have not had any power issues. Make sure to put the white wire on the proper side. Examine your outlet if you need to. Next, the PVC couplings, be prepared to spend time finding the parts to connect your pool hoses but it can be done relatively cheap at your hardware store. Also, metal o-ring clamps will help a lot to eliminate any leaks. I upgraded to a stronger pump filter, it’s still not quite enough to trigger the flow lever. Others have added a metal washer to create a bit more surface area but I decided to super glue a lego brick under it which means I have to be very careful and ensure it’s only plugged in when the pump is running otherwise it will pop the heater’s hot circuit (under the little screw cap) and potentially break the unit. This is how I broke my first unit. The most important concept to consider is the relationship between heating your pool and water flow. As water is flowing through, the water is picking up a little bit of heat from the coils each time and then going back in the pool and sharing that little bit of heat with the rest of the pool. The little pump will not move the water fast enough to warm the pool. I upgraded to the 1500 gph and to 1.5” hoses using hose adapters. You also should start with warm water otherwise it’s 2-3 days of running 24 hours to get the pool warm. After it’s warm it needs about 6-8 hours a day to keep it warm and surprisingly I didn’t see a huge difference in my power bill. Last connect to output of the filter pump; after the water has been filtered. No need to get leaves and dirt stuck on the heating element. Good luck.

I recently encountered a frustrating issue with a defective hot tub heater and feel compelled to share my experience. Unfortunately, I have already gone through two of these heaters, and both have failed to meet even the most basic expectations. The initial heater I received suffered a catastrophic failure, resulting in the complete meltdown of the top cover. This occurrence was not only a significant safety concern but also a complete disappointment given the short lifespan of the product. Hoping that the second heater would fare better, I reluctantly purchased another one. However, after just a few months of use, it became evident that the heater was not functioning properly. It ceased heating beyond 92 degrees, a significant drop from its advertised capacity of 104 degrees. Concerned about this decline in performance, I promptly reached out to the customer support team for assistance. To my dismay, their response was dishearteningly dismissive. They suggested that the use of chlorine, a standard chemical for hot tub maintenance, may have corroded the heater, leading to its malfunction. I found this perplexing and frustrating, as it seems counterintuitive to advertise a product specifically designed for hot tubs while prohibiting the use of chlorine—a common and necessary chemical for proper maintenance. In an attempt to resolve the issue, the support team forwarded me a form that required me to open up the unit and perform various tests on the cables to assess resistance levels, among other things. However, I firmly believe that it is the responsibility of the manufacturer to ensure the functionality and reliability of their products, especially within the stated warranty period. Asking customers to troubleshoot the unit themselves is both inconvenient and unprofessional, particularly when the product's heating capability deteriorated within a mere few months. I had hoped for a more collaborative approach to finding a solution. Compounding my disappointment, I had taken the precaution of purchasing the Asurion warranty from Amazon, which was bundled with the product. However, when I attempted to make a claim under the warranty, I was informed that the hot tub heater I purchased is not supported by the warranty due to it not being considered a compatible brand. This raises the question of why such a warranty option is even offered if it does not cover products from certain manufacturers. It is deeply frustrating to be denied coverage after taking the initiative to protect my investment.

3 star because its very slow of heating 275g of jacuzzi. So its about 1.5f degrees per hour of heatwhen out side 65f and lead is closed so you get whay you pay .Definitely work and helps to heat up our jacuzzi which it has 1kw heayer all ready

I've owned and worked with a lot of these pumps. I also refer a LOT of people to these who are building heated stock tank pools. They work great to put inline after your pool filter/pump. However, they're not very well built and the trigger to engage the heater is often way out of tolerance and essentially doesn't work. I'd say that 1 out of 3 are defective in some way. Before you install it, see if the the flapper engages properly. Quite often, even full motion of the flapper doesn't engage the heater, and it simply won't turn on, ever. When you see people gluing washers or nickels or whatever to the flapper, it's not because their pool pump is weak, it's because the tolerance is way off when these are built. The other issue with these is that the temperature dial is prone to failure in time. I've had them fail. Since I use a temperature controller, I can often bypass the built in temp dial. But this is not suggested, as it will void the warranty. But the temp dial is garbage anyways. There is no way to set it reliably at all, if you're trying to hold a hot tub tempt steady. Overall this is a good value, but definitely has some issues.

I bought this to use to turn our 8ft diameter stock tank pool into a hillbilly hot tub. The reviews here are hit or miss, but I have nothing but positive things to say about it. We’re hitting 110 degrees, but here are a few critical tips if you’re using it with a stock tank pool. 1. Wire it up to a heavy duty plug and use it on an otherwise unused gfci protected outlet. I wired mine to a heavy duty outdoor extension cord and it works fine. 2. You need to have good flow from your pump in order for it to activate. Like someone else here posted, I epoxied a large fender washer to the metal flapper arm on the outlet side of the heater. Before that, even with our 1500gph Intex pump, the flow switch would only occasionally engage (you can see this if you remove the top cover and watch when you run water through it. With the washer it engages with authority. 3. It took me about an hour at Lowe’s to get the fittings together that would allow me to hook this up to my pump and outlet valve, but the most critical part was buying a length of flexible hose meant for pool cleaning accessories (also from Lowes) and a couple flexible rubber reducers. 4. The most important part that I learned was that these things take a good bit to get up to temp. I thought mine wasn’t working because I felt no heat from the unit in the first hour or two. The issue was that with a large 700 gallon tank like ours, the initial heat takes a good 12 hours. The water hit 95 degrees in 12 hours, but went all the way to its max of 110 degrees within another 6. Using it with a DIY insulated cover (1.5” rigid foam and redwood fenceboards) I only need to run it for a few hours a day to keep it around 100 degrees. Obviously this is no substitute for a 220v powered, and heavily insulated modern hot tub, but if you like the aesthetics of a rustic stock tank pool but want to use it when it gets cold, this is a solid way to go.

I got this heater to install in a hot tub I was building. It installed easily after finding a bunch of reducers to fit my application. At first, it wasn't heating. I contacted amazon and they sent me a replacement. While I was waiting for the replacement to arrive, I took off the top cover of the original unit. The flow switch wasn't seated fully in its cradle. I pushed it down and put the cover back on. It heated the water in my hot tub to 102 degrees in 2 hours!!! Its worked great ever since so I’ll be returning the replacement. Great little heater

Despite ad spec info listed on Amazon saying that the heater was for pools and hot tub spas (most of which are outdoors), one of the instructions that come with the water heater says "For Indoor Use Only". The headline above the instructions for the product note as a Whirlpool Bathtub Heater, not for pools and hot tub spas. However this statement not only contradicts the use and spec information provided in the ad for the Amazon listing, the Basic Requirements & Troubleshooting instructions provided for the product show illustrations for proper hookup to an outdoor hot tub. The only assumption here is that perhaps the heater could be used for both a whirlpool tub and a hot tub. It is supposed to work on a dedicated 110V electricity line with a 20amp circuit and an GFC outlet (all of which are my setup). It also states that it is suitable for up to 450-500 US gallons (my hot tub capacity is less than 200 gallons). And it should function up to 40 degrees centigrade (104 degrees Fahrenheit). However the heater trips the circuit if setting near the max temperature dial and only reaches barely above average body temperature. It then begins to drop its temperature within a couple days to well below average body temperature, never regaining even its highest temperature and eventually quits heating. In addition, the Reset button for attempting to restore proper heating functioning does not work. It does not press in as instructed and shown in the instructions. Finally, the only option offered for return and replacement provides a lot of room for the manufacturer to claim improper installation AND the only way provided for communicating with the manufacturer is via a line that says, "feel free to contact us by E-mail". However, no email address is provided. Safe to say this was a very disappointing purchase with no apparent way to get a refund or replacement.