Connect macerating toilet to flange?

[anomamatt]

I own a 2019 Quantum PD31. It has the infamous (read: stupid) design of the curb side toilet dumping into the very shallow side of the black tank. See attached image. Even after hydrojetting the tank (to make sure there was no existing pyramid complicating things) and trying the calgon trick, "loads" clog easily because there is so little clearance where things drop. I know this above has been discussed a lot. I know I can keep using a stick (or an old garden hose piece is what I have been using) to make things go down as they should. But I'm over doing that and otherwise I love this RV (despite a few other strange quirks).

So I decided I want to switch to a macerating toilet. (I know the pros and cons and I realize people will think this solution is overkill. But I want a solution and this over with before the spring). I like the Tecma Easy Fit toilet. I need a low profile. So far so good.

I read the installation manual and I promise I have done a search. :-). My question is: you can have these toilets with a vertical exit, but the exit is a 1.5" pipe. Can I just adapt the 1.5" output to the 3" hole in the existing toilet flange? Has anyone done this? It seems as long as everything lines up, this should be OK?

If these toilets were not so expensive, I would have tried it by now. But while I'm good/decent at DIY, I don't want to drop over $1K and find out this won't work as I am hoping.

I'm hoping someone has tried this and has some advice or suggestions on how to make it work. Thank you!

[Bob Nodine]

Originally Posted by anomamatt

I own a 2019 Quantum PD31. It has the infamous (read: stupid) design of the curb side toilet dumping into the very shallow side of the black tank. See attached image. Even after hydrojetting the tank (to make sure there was no existing pyramid complicating things) and trying the calgon trick, "loads" clog easily because there is so little clearance where things drop. I know this above has been discussed a lot. I know I can keep using a stick (or an old garden hose piece is what I have been using) to make things go down as they should. But I'm over doing that and otherwise I love this RV (despite a few other strange quirks).

So I decided I want to switch to a macerating toilet. (I know the pros and cons and I realize people will think this solution is overkill. But I want a solution and this over with before the spring). I like the Tecma Easy Fit toilet. I need a low profile. So far so good.

I read the installation manual and I promise I have done a search. :-). My question is: you can have these toilets with a vertical exit, but the exit is a 1.5" pipe. Can I just adapt the 1.5" output to the 3" hole in the existing toilet flange? Has anyone done this? It seems as long as everything lines up, this should be OK?

If these toilets were not so expensive, I would have tried it by now. But while I'm good/decent at DIY, I don't want to drop over $1K and find out this won't work as I am hoping.

I'm hoping someone has tried this and has some advice or suggestions on how to make it work. Thank you!

We have a 2022 Quantum PD31 with the same problem. We looked seriously at installing a macerating toilet but came to the conclusion that they were either to large or did not have a down exit port. We installed a shut off valve behind the toilet to turn off the water temporarily while using an awning rod to unplug the downpipe and break up the pile. One of the problems with our coach is that because the black tank has a slope towards the driver side the black tank must be filled to about 80% to get water under the toilet.

[lwmcguir]

My macerating toilet use requires filling with water via the auto fill button prior to use, then the flush is timed using significant flow

Havent tried measuring the water fallons per use however it would have to be a positive per the issues you guys are facing

The black tank it discharges to has a 1.5 inch dump valve

Why wouldn't it work much better?

[anomamatt]

Originally Posted by lwmcguir

My macerating toilet use requires filling with water via the auto fill button prior to use, then the flush is timed using significant flow

Havent tried measuring the water fallons per use however it would have to be a positive per the issues you guys are facing

The black tank it discharges to has a 1.5 inch dump valve

Why wouldn't it work much better?

I have tried using a ton of water before and after and that doesn't help the situation. The problem lies in that the toilet dumps into a tank depth less than 3 inches. It's really short there. And as Bob Nodine wrote, to have any water in the tank at the point where the toilet dumps, I needed 25 gallons in a 28 gallon tank. Obviously that won't work.

Like Bob is doing, most owners wind up using a makeshift rod of some sort. That's what I'm doing with a thick garden hose segment.

The macerating toilet should be better because the pieces will be much smaller that enter the tank. There is no "stack" of material that will cause a problem with such a shallow entry point (I forget the exact measurement, but the black tank is less than 3" deep where the toilet dumps. It's just an awful, awful design.). It'll use a lot of water, but I have been using a lot of water with my unsuccessful methods anyhow.

[anomamatt]

Originally Posted by Bob Nodine

We looked seriously at installing a macerating toilet but came to the conclusion that they were either to large or did not have a down exit port.

Yes, it took a lot of research to find one that I *think* will work. A low profile MasterFlush 7640 would be the ideal replacement, but they do not make those (that I could find). I say that because the MF 7640 is designed to fit overtop of a toilet flange.

I assume all these have the toilet on the step and need a low profile. The Tecma EasyFit Low profile (Thedford #38836) looks like the best option. It has a vertical (down) exit option and is also low profile. Dimension wise it seems to work, as long as I can find a way to line up the 1.5" toilet exit with the 3" opening in the flange.

I'm only hesitant because of the cost of the toilet. But if I wind up doing this, I will come back and report my success or failure and whatever lessons I learned.

[lwmcguir]

We're on year 7 with the macerator toilet in the Tuscany

It only gets used perhaps 50% as the girls bathroom

No issues other than filling the tank faster

[Bob Nodine]

Originally Posted by anomamatt

Yes, it took a lot of research to find one that I *think* will work. A low profile MasterFlush 7640 would be the ideal replacement, but they do not make those (that I could find). I say that because the MF 7640 is designed to fit overtop of a toilet flange.

I assume all these have the toilet on the step and need a low profile. The Tecma EasyFit Low profile (Thedford #38836) looks like the best option. It has a vertical (down) exit option and is also low profile. Dimension wise it seems to work, as long as I can find a way to line up the 1.5" toilet exit with the 3" opening in the flange.

I'm only hesitant because of the cost of the toilet. But if I wind up doing this, I will come back and report my success or failure and whatever lessons I learned.

Thanks for the info and yes report back if you do this project.

Bob