Heat and water safe material for internal dishwasher repair

The recommended, long term method

There are quite a number of places on line that sell repair parts for all types of home appliances.

It will likely be easier to purchase and install the proper replacement part than to attempt to repair a part.

Using your favorite internet search engine, look for

replacement parts <make> <model>

Where <make> = Whirlpool, or GE, or Bosch (as appropriate), and <model> = xyz, or pdq, or alpha123soup-b as listed on your machine.

and you'll probably come up with 4* options right off the bat!

*number guaranteed to be correct for as long as it took me to type it.

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The short-term quick fix methods

Since the OP has indicated that he's looking for a short-term repair before replacing the appliance...

All the big-box home improvement stores stock all sorts of miracle leak stopping tapes and wraps that will work on anything from glass to plastic to metal to cement and more!!! (As seen on TV!™) You could probably even pick some up at your local 24-hour superstore while you're getting groceries.

It seems like this would be a good time to try one out and see how close it comes to the claims on its package. If one doesn't work very well, try a different brand. I've never had need to use any, so couldn't make a recommendation.

If you wanted to be really solid, but spend a bit more money (or maybe not), and can get that pipe out of there, a rubber coupling (sometimes known as Fernco connector) should be more than sturdy enough to hold in the pressure and, for only a couple of years the rubber should take the heat, as well. It might not last much beyond 2 years, but that's all your looking for.

If the tube has melted you better find out why? It's unusual for that to happen.

That being said, I can't count how many hoses, radiator hoses, PVC pipes i've fixed just by wrapping black vinyl electrical tape around the ruptured part. Don't skimp on the tape and pull it tight. Add two or three layers.

When I was 17, a mechanic helped me repair my radiator. He was swamped with business and didn't feel the need to take money from me for something I could do on my own. While the fins were metal, the tubing on the back side of the radiator was molded plastic. He used a garden hose to force water into the radiator and showed me where a crack was in the plastic and told me to take it out, clean, dry it, and find the best silicone I could find; one with a high melting point. I got a tube from the big box store and viola; it was fixed for years. I suspect this could work here as well, but you need to make sure the silicone is food safe.

If you know anyone who will donate a lady's nylon stocking and you have some 1-hour epoxy on hand, cut the stocking into strips, mix up a batch of epoxy, wet the strips with the epoxy and wrap the epoxy-soaked strips around the plastic part, overlapping for double or triple coverage. Just like gauze and plaster on a broken arm. I've done this kind of repair on plastic parts, and it's waterproof and amazingly strong after it cures. Use rubber gloves. It's probably best to let it cure for 24 hours before using it. Run a wash cycle with no dishes to wash away any unmixed / uncured epoxy.