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a few makers do add the extra pump but do so at the expense of running the heater while having all 3 THERAPY pumps running. What this means is that if you want every jet to run you than have 2 choices take away jets or make them smaller to cerate more pressure .......
Boy, picking the right tub is stressful (and a lot of $$$). I just want to be happy with the purchase and destress!!!Thanks
So what exactly is the downside to running three pumps again? If you can run three main therapy pumps and give good therapy to every seat, what's not to like about that? You suggest that you can't use two pumps and provide adequate therapy with all diverters at neutral. The Marquis solution is to eliminate that option and provide concentrated therapy at the expense of running all the jets - yes? So if you add another pump you can get the best of both worlds?
To run 3 pumps at once you heater in effect becomes like a spa that runs off 110 it will not run at the same time as all three pumps.
I'm still waiting for the negative to this.
Take Mendocino's post, delete all sentences EXCEPT the last two, and you have some EXCELLENT advice. Forget all the other marketing garbage and let your wet test be your guide.
You can't have the heater on when all 3 pumps are on so the controller automatically disables the heater until one of the pumps is turned off. How much of a negative that is depends on where you live, how long you soak, what is the outside temp, how many people are in it (you don't always run all 3 pumps at once), etc. If you live in Vegas I'd imagine it's hardly ever an issue. If you live in Chicago it may be an issue at certain times.
Well, I can think of one brand that seems to be able to run three pumps without having the heater run and not have issues in the cold. That alleviates the requirement to make do with two pumps as Mendo suggests is necessary.
It will maintain the heat pretty well (same as the other spas with 3 pumps) but it will lose definitely loose heat with the cover off. How much of an issue varies as I'd mentioned earlier. It's like stirring a cup of coffee; are you doing it indoors or outside,summer or winter, 15 seconds or 15 minutes, etc.
I'll let you know. It could be argued the other three pump tubs are of a different design and don't make as efficient of use of the pump heat. I won't get the sub zero temps of the folks up north, but if it holds or gains after 40 minutes to an hour in the teens I'd say it's doing OK. We've only hit the 30's and it's still gaining temp during operation without the heater running.