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Old 11-29-2019, 11:31 AM   #1
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tankless water heater problem

Has anyone experienced the water heater working showing 124 degrees F, but, actual temperature at the faucets are around 88 degrees. It appears that cold water is leaking into the hot somewhere after the heat exchanger. Anyone experienced this previously.
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Old 11-30-2019, 09:11 AM   #2
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Has anyone experienced the water heater working showing 124 degrees F, but, actual temperature at the faucets are around 88 degrees. It appears that cold water is leaking into the hot somewhere after the heat exchanger. Anyone experienced this previously.
Can you hear the burner coming on? Also, if I recall, a little flame shows up on the readout when the burner is on.
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Old 12-01-2019, 07:22 AM   #3
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tankless water heater problem

The light goes on and the burner works fine.

There appears to be a bypass somewhere that is letting in cold water when the hot is all the way on. If you start adding cold water, the heater may shut down due to lower flow through the heat exchanger. Frankly, I have trouble understanding how you can add additional cold water to it without the flow through the heat exchanger shutting down due to low flow.
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Old 12-01-2019, 08:59 AM   #4
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Do you have an outside shower? Make sure both valves are turned off. Water can mix if the valves are open, but the valve at the head is closed.
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Old 12-01-2019, 09:26 AM   #5
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Low city water pressure can and will effect the opereation of the tankless. I would preform this test with 1) The fresh water pump in operation only. 2) City water only. 3) City water with pump assist. I can align the water for dry camping, connect city water, and turn on the pump if needed.

I have dealt with techs at Gerrard (very helpful) and yes we had to have ours replaced (4hrs to replace by the dealer) and it is a major difference in temp. No adjustment for temp control on the Gen 3 tankless unit itself. The manual shows a white knob (water flow) on the back of the unit and I can see it when replacing the house canister filter, but way to far in there to reach.

** Mixing type facuets must be at full hot water only. Any manual mixing of cold will not allow the tankless heater to operate correctly. If your water is to hot or to cold adjust the temp at the control panel only.

1) The DW has on occasion had the shut off valve on the shower head (inside the RV) in mid position and that caused issues taking a shower.

2) My house canister filter clogged once (reduced flow pressure) and now we use additional filters. Depending on the quality of water I will use dual blue torpedo type filters in addition to changing the house filter often(r).

3) By tech at Gerrard the only adjustment to the Gen 3 is the temp control panel inside bathroom.

All my faucets inside the RV are mixing type (Yuck). The only true testing is at the outside flushing connection. You will need a stopwatch, meat thermometer, and a 5gal bucket.

1) Remove the spray head on the outside flushing station.
2) Cold water only, record the cold water temp (this is your ground water temp)
3) Hot water only, record the max temp (during filling the bucket)
4) hot water only, record the time it takes to fill the 5gal bucket, full stream (hot water)

Simple testing. Remember to preform these test three ways. As stated before ensure the filters are new (or removed for testing purposes). After you have those recordings, call Gerrard and discuss with them on actions.

Good Luck !!

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Old 12-01-2019, 11:52 AM   #6
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Thanks for the ideas. I will do a more complete test. However, my non-mixing faucet in the bath room shows about 88 degrees when the water heater is showing 124 degrees F.

I have good pressure everywhere and presently do not have a water filter installed.

I have checked and adjusted the white knob on the water heater. Interestingly, it is fully open and shows 124 degrees on the controller. However, if you reduce the flow with the white knob, it won't work at all. So the knob must remain fully open.

I will try the bucket testing and see what I find. Thanks Paul
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Old 12-01-2019, 12:22 PM   #7
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I HATE my tankless water heater, period . My 25 year old camper had a tank water heater that was oh so much better.

I found a problem with my bathroom sink getting any hot water at all. Turned out that the flow restrictor that was installed was too restrictive and would not allow enough flow for the tankless to fire up. I changed the restrictor and now, if I want to wait until the cows come home, hot water will appear at the sink.

To wash dishes in the sink I have to first turn the hot fully on and then slow it down just a bit to get the hottest water I can. At full flow it appears the water heater can't keep up and the temp drops a tad. If I slow it down a bit the water gets hotter.

Showers while dry camping is a challenge. I set the tankless to 100 degrees and only use the hot valve. This mostly works.

If the water in my tank is really cold the water heater has a harder time getting it up to 124 degrees. While it is heating, the display will show the output water temp which isn't holding at 124.
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Old 12-01-2019, 12:44 PM   #8
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I HATE my tankless water heater, period . My 25 year old camper had a tank water heater that was oh so much better.
I found a problem with my bathroom sink getting any hot water at all. Turned out that the flow restrictor that was installed was too restrictive and would not allow enough flow for the tankless to fire up. I changed the restrictor and now, if I want to wait until the cows come home, hot water will appear at the sink. To wash dishes in the sink I have to first turn the hot fully on and then slow it down just a bit to get the hottest water I can. At full flow it appears the water heater can't keep up and the temp drops a tad. If I slow it down a bit the water gets hotter. Showers while dry camping is a challenge. I set the tankless to 100 degrees and only use the hot valve. This mostly works.
If the water in my tank is really cold the water heater has a harder time getting it up to 124 degrees. While it is heating, the display will show the output water temp which isn't holding at 124.
I had a tankless in my North Point and when I ordered my Pinnacle, Jayco no longer offered the tankless option. Now I'm glad they didn't!! My 10 gallon electric/gas tank is far superior!
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Old 12-02-2019, 04:16 PM   #9
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We have had numerous problems from our Gen 3 Girard. One more and I'm changing it to a tank.
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Old 12-02-2019, 04:40 PM   #10
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Interesting that so many have had issues with their Girard water heater. I replaced my 10 gallon water heater with the tankless and have been pleased with it. I do have residential faucets throughout our trailer so we get plenty of flow.
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Old 12-02-2019, 06:24 PM   #11
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Interesting that so many have had issues with their Girard water heater. I replaced my 10 gallon water heater with the tankless and have been pleased with it. I do have residential faucets throughout our trailer so we get plenty of flow.
Good flow is the determining factor on the tankless performance. But when we had the tankless and were at CG's that had very low water pressure it struggled.
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