Hello,
I just bought a house with a leaking hot tub...I know I know, I've read all the leak stuff, this leak is different. It is not coming from either of the pumps/seals, gate valves or heater. If I turn off the hot tub and let the water cool down the leak stops. I filled the hot tub up to the very top and let it set all night, no drips under the deck. But if i turn the power in as soon as the water gets hot it will drip 3/4 drops per second. Anyone have a clue, Its not the shell right? It is full now, cold, and no leak. Is it possible a seal fails when it gets hot? anyone with feedback would be great. isaac

Hello Isaac. I have no of informed opinion to offer and probably write here only because I hate to see a post goose-egg, and perhaps this might stimulate some interest from somebody WITH an informed opinion. Beyond that I can commiserate with you a little. I purchased a used tub that has a very slow leak NOT in the areas you mention too. I'm basically exercising the ostrich-head-in-the-sand technique with it. It isn't really harming anything and is more annoying only by its presence than any inconvenience or what damage it probably won't actually produce. I THINK mine is coming from or around the courtesy light into the tub. I'm just not willing to spend $357.86 (or whatever) for an official spa guy to come out w/some caulking. So, I say: DON'T WORRY ABOUT IT -- a little leak just gives your tub CHARACTER! " title="Wink" />

You fail to mention if you've traced the leak back to its source or where leak is coming from. 3-1 odds I'm guessing faulty seal/gasket. Something is failing to hold the water when it heats. Keep us updated.....

If it's leaking under a pump could be shaft seals or the rubber gaskets attaching plumbing.Under heater -gaskets or around heater housing,could be small crack in plumbing,post more details so we can narrow done the area please.

Heat softens everything. It is very possible that you have a leak in a hose fitting to a jet or manifold. If it is a full foam spa you can put food coloring in the water and then dig the foam following the color until you find the leak. Otherwise just remove your cabinet by where it is leaking while it is hot and you should be able to locate your leak using a flashlight. Then remove and re-glue and clamp. Good Luck!