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As long as the Sonoff can handle the current loads that it would be subjected to handling the load current in the heating circuit then fine but if it turns out that the Sonoff cannot reliably handle those loads then the way I've suggested is pretty much how he'll have to do it.

@Jrock817 Here are some things to think about when considering what kind of tub you want to buy. First of all, how much do you think you're going to use the jets and do you need a kajillion of them? I think a lot of people who are new to hot tubs tend to think they'll use their jets a lot and...

@wayner I am coming into this conversation late and even though I did skim over what was said in many of the previous posts, I admit that I did not read everything so I'm not sure what I'm about to day has any relevance or is redundant or whatever but FWIW, this is what I have to offer. I had a...

Thanks, @RDspaguy, I kinda figured that would be the case but I just had to throw it out there in case there was some clever trick out there that I just couldn't think of. Dang, I wish that tub had isolation valves either side of the jet pumps! It's -13C so I really can't drain it now... :(

Watkins makes their shells out of acrylic and maybe ABS too. My old Grandee is an acrylic over ABS shell, not sure what the newer ones are made of. If yours is Acrylic or Acrylic over ABS then Plast-aid will fix any crack you might have in the shell if you can get to it. Just V groove out the...

I filled my nearly 30 year old 1995 Hot Springs Grandee late this year. Got it filled just before the freezing weather hit. I've had it running for maybe a week now and I've noticed the wet ends of both jet pumps are leaking out the back (I suspect bearing seals have worn out). On one of the...

The Plast-aid product you used is only useful for bonding Acrylic, ABS or PVC. It doesn't work on any other plastics or materials. The liquid solution softens/ partially dissolves the acrylic and the powder that you push into the crack also gets softened/partially dissolved by the liquid. Then...

I'm looking at ordering a new cover for my hot tub and I notice that some of the vendors up here offer an alternative to the standard marine grade vinyl material that I'm used to using. One vendor calls it Weatherguard but the others I've looked at call it Atlantis and one vendor I've looked at...

@Groot, I have a 28 year old Hot Springs Grandee spa which predates IQ2000 but I have modified it to use an IQ2000 system. It has the new 6 KW heater in it instead of the original 5.5 KW heater which died a long time ago. Those 30A heater relays the IQ2000 systems use were barely sufficient to...

I see I'm too late to offer a suggestion but I would've recommended using Plast-aid instead. It would've given you a stronger bond than JB Weld could. JB Weld just gives you a mechanical bond but on plastics like ABS, PVC and Acrylic, Plast-aid actually gives you a chemical bond which is much...

I disagree with a lot of what you are saying about 24/7 circ pumps. The one on my Hot Spring runs 24/7/365 whether the heater is on or not. It is NOT less efficient from a system that uses a jet pump part time for circulating. It is, in fact, much more efficient. Trying to make a large electric...

@Daf-Tekno , I too am from Calgary and would like to chime in on the perimeter vs injected foam insulation question. I have a 27 year old Hot Springs Grandee tub that I bought used with a number of problems but now have running flawlessly. During the first couple of winters I had with that tub...

Wherever you decided to order from, id you haven't already seen it, I recommend you check this old thread of mine before you order... All Spa Owners Should read this: Valuable Lesson Learned: ALWAYS Pull hot tub cover cores out and check them when you receive a new cover

I have a 1,893 L (500 US Gal) tub. Over time, I have gotten to know how much chlorine my tub needs with regular usage so I just keep a set of plastic measuring cups (1/2 cup, 1/3 cup etc. size) handy beside the tub so when I get out of the tub I pour out roughly what I need into one of those...

Personally, I don't like many of the newer hot tubs that are out there because they're too molded with too many sharp ridges and contours and I don't like how they force you to have to sit in a specific place and in a certain way. You can't sit an inch over in any direction from where they want...

Mine is fixed now. See my other thread about relay upgrades to see a pic of how spectacularly that heater relay failed. Between now and Friday, be sure to keep the circulation pump going. Being a Hot Spring, your tub is well insulated so it will take a while for the temp to drop far enough that...

@Rattus Suffocatus Yes, the breaker had tripped so I reset it only to see a bright flash of white light and hear very loud pop/bang which, evidently, was the relay blowing up. Kaboom! Then I could smell burnt wire insulation. Note to self: the next time I see the 30A heater breaker has...

This relay failed spectacularly. Done blowed up real good.

It's weird that you get nothing when checking resistance through the heater element. If there's no continuity through the element you should get open/infinite. If there is continuity through the element you should get some resistance. If you get 0 that means a short. Does it make your 30A GFCI...

@SallyD Let's just summarize a few things here: 1. You're using softened water as your fill water. What is softened water? Well, hard water is high in calcium (Ca) and (Mg) and relatively low in (Na). Softened water is water that has had most of the Ca and Mg ions knocked out and replaced with...

The best glue for gluing acrylic or ABS is a product called Plast-aid. It's more than just glues and epoxies which only form mechanical bonds with the acrylic or abs substrate; it contains a solvent and plastic powder that actually forms molecular bonds (which are much stronger than mechanical...

@Kidswimin I have a '95 Grandee which had an older control system in it than you've got. If you have a '99 Hot Spring, you should have the IQ2000 control system right? Or has it been upgraded to an IQ2020? I now have one of those IQ2000 systems in my tub. And what heater do you have? The newer...

@RDspaguy Well, the same thing happened with the replacement IQ2000 control system that's now in my tub that always happened with the original control system: the heater relay blew up again. This time it blew up real good. Those Potter & Brumsfield 30A General purpose relays just cannot handle...

@RDspaguy Now I'm catching what you're pitching! I hadn't thought of doing things that way but it makes perfect sense. I will definitely consider doing that. Thanks for the good advice.

On my IQ2000 system they are using 1 P&B 30A relay as the heater interlock supplying load power to an identical heater relay. Both relays are handling both legs so the setup is identical to my previous control system and so should have the same problems. I'll run with the system as is for the...

@RDspaguy I looked at replacing the two heater relays with 50A contactors but the ones I found were really expensive and out of my budget range. I was also thinking of mounting them in the original control box at that time and they were too tall to fit in there. Then I started thinking more...

@bwilford I also have a wifi enabled system that I'm putting in that will allow me to inject chlorine with a dose pump using my phone but it's just a "dumb" system that doesn't allow me to see what the FC level is. I just know that every time I cycle the dose pump it injects enough chlorine to...

@Miskelley Nancy It's jvery likely that your temp sensor that has drifted a little. I don't know what type of temp sensor your system uses but my guess is it's using a NTC-10K thermistor as the sensor. A thermistor is just a resistor whose electrical resistance varies with temperature at a...

@Esand323, the stain appears to be an iron stain which you would get even at a low dissolved Fe concentration. Here in Canada, the various water quality guidelines that are in use all set the guideline limit for dissolved iron at 0.3 mg/L or ppm. I suspect the US guideline limits are similar...