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Water leak in heatexchanger

Tring to find out the best place to start to remove the proper parts to get the heat exchanger out on a rp2100 natral gas pool heater

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Go from the top down. Lid, then face panel, then the sides until the exchanger is exposed enough to access the inlet/outlet header and the sensors.

Posted on Jul 04, 2010

Testimonial: "thank u ! i sprang a leak 1 week before a big graduation party i was hosting and ur advice helped to save time to weld it & reinstall it for the party"


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Posted on Jan 02, 2017


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Have a Pentair Minimax Plus 400 heater leaking water. How do you get the top and flue collector (gas is turned off at source) off so you can see if the heat exchangers are leaking, or is there another way...

There are multiple screws around the perimeter, remove them then lift of the top. Then there is multiple pieces of sheet metal that also needs removal. Then the baffles sit right on top of the heat exchanger which will easily be removed once the sheet metal is removed. then inspect the exchanger.

Good luck

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Bosch Aqua-star tankless water heater had water on gas valve, dried gas valve, I have a spark but will not light

Water in the gas valve is DANGEROUS! The major question is did the water come from a leaking heat exchanger or the product of combustion? If it is from the heat exchanger it may be covered under the warranty (if the installation is proper). If it is from condensate in the flue pipe, it is from an improper installation. If you go to you can find a service provider in your area. I service a very large part of NY, some of NJ (Northern) and all of CT.

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How to replace swimming pool heater core

I assume you are referring to the heat exchanger. Usually when these fail the heater is replaced. Reason being that this is the biggest money part of the unit. The part alone will run pretty deep into the price of a new heater.
Then you still have the old burner tray, old gas valve, old thermostat and old internal ignition device. Each of these components run several hundred dollars apiece. It doesn't make sense to throw good money after bad.
If this exchager was leaking from a salt water pool (common these days) it would be advisable to replace the heater with a Sta-Rite MaxiTherm with the cupro-nickle exchanger. This part is coiled which allows for better water flow and less corrosion than a standard copper exchanger.
To replace the exchanger is not all that tricky if you are handy with a screwdriver, wrenches and plumbing. If you have any doubts get a pro over. Remember you are literally playing with fire.

Nov 15, 2012 | Raypak Rp2100 Pool & Spa Heater Lonox 407k...

1 Answer

Water is dripping down inside the heater on the left side,pool co. says I need to buy a new heater. Any thoughts?

The heat exchanger is the problem and it is expensive to fix. If the leak has gone on long enough to damage other parts or the heater is getting older than 8-10 years then it is likely better to replace it.

If the unit is newer and in decent shape then fixing it is an option but total for parts and labor is nearly half the cost of a new unit so consider carefully if the repair is really worth it.


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1 Answer

Water is leaking from inlet/outlet area. is that a heat exchanger problem?

If there is a water leak in between the pool/spa plumbing and the inlet/outlet manifold, it just needs a new gasket if it is a plastic manifold, and if it is a cast iron manifold, the 2" threads for inlet and outlet need to be unthreaded, then coated with a pipe sealant (non-teflon) then rethreaded.

If this leak is in between the outer and inner inlet/outlet manifold peices, then a new gasket is needed. The part number for that gasket is: 006713f.

If the leak is coming from inside the cabinet and leaking down the interior or exterior, it could be a heat exchanger issue.

The most likely event is that the o-ring that seals the header manifold is worn and needs to be replaced.
This would take about 30 minutes of labor and an o-ring.

Please vote positively if this has helped.

Nov 01, 2010 | Raypak Rp2100 Pool & Spa Heater Lonox 407k...

1 Answer

Leak from both top and bottom of the recessed area which holds the thermol coupler senor bulb inside the copper water priping

Not sure i quite understand, but if your saying the water is leaking from the copper heat exchanger, then you need to replace the exchanger itself. Not cheap.. but do-able. 9 times out of 10 a leaking heatexchanger is caused by chemical abuse ( low pH)

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Raypak pool heater is making a knocking noise

low water flow check manual bypass in heat exchange if spring broke letting too much water bypass and overheating water in unit also see if pump ok and filters

Jun 11, 2010 | Raypak Rp2100 Pool & Spa Heater Lonox 407k...

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Jandy Lite 2 LJ Water Leaking

I have the same problem, removed the heat exchanger and found a small rubber gastket that was ripped. The gaskets can be found at parts store. Set of 18 about $20.00.can.

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I have a hayward H200 series heater and th eheat exchanger is leaking. I have pulled the heat exchanger out and cant see anything visible it is probably leaking inthe area covered by the fins. I have...

NO. The heat exchanger comes complete with the header and as you know, is very expensive. You will not be able to see a hole wherer it is leaking. It is nakes to the eye. But if water is coming out, the exchanger is bad and will need to be replaced. Where are you located? I can probably beat any price out there. Part number is idxlhxa1400.
You can contact me at

May 09, 2010 | Hayward H Series Pool & Spa Heater 400k...

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