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Old 01-23-2022, 03:38 PM   #1
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Hot Water

Hello all, I have a 2019 XLR Thunderbolt. I purchased new and since I purchased have had a problem with the hot water getting to the shower. I can get it to work by turning on the sink faucet but then I lose pressure. I have taken it to the shop 3 times and still have the problem.
Bottom line is heater works ok, if I just turn on the shower I get no hot water. If I turn on both shower and sink I can get hot water.
Need help
JFuller
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Old 01-23-2022, 04:11 PM   #2
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Originally Posted by jfuller508 View Post
Hello all, I have a 2019 XLR Thunderbolt. I purchased new and since I purchased have had a problem with the hot water getting to the shower. I can get it to work by turning on the sink faucet but then I lose pressure. I have taken it to the shop 3 times and still have the problem.
Bottom line is heater works ok, if I just turn on the shower I get no hot water. If I turn on both shower and sink I can get hot water.
Need help
JFuller

Can you tell us the make/model of your water heater?
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Old 01-23-2022, 04:58 PM   #3
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Hot Water

The book I have is a Girard Products Model GSWH-2 Tankless Water heater
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Old 01-23-2022, 04:59 PM   #4
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Can you tell us the make/model of your water heater?
X2.

Many on-demand type water heaters need a specific flow rate for the water heater to fire.

It could be you don't have enough flow just from the shower. Many shower heads/faucets are restricted purposely to conserve water.
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Old 01-23-2022, 05:18 PM   #5
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Thank you for your response. It has always been this way no matter where I hook up since I purchased the RV. I do have a regulator on the RV at the inlet. Maybe it is my shower head.
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Old 01-23-2022, 05:30 PM   #6
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Remove your shower head and try with just the shower on only and see if you get hot water then. It could be your shower head is a water saver and not allowing enough flow rate for the on demand water heater to kick on. If you get hot water at least you know you can purchase higher flow shower head to meet your needs.
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Old 01-23-2022, 07:29 PM   #7
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Thank you for your response. It has always been this way no matter where I hook up since I purchased the RV. I do have a regulator on the RV at the inlet. Maybe it is my shower head.
Sometimes the flow restriction is the shower head itself (depending on internal design) sometimes there is a flow restriction washer either where the shower head connects to the flex hose and sometimes the flow restriction washer is where the flex hose attaches to the shower faucet.

Many folks either remove the restrictor washer or drill the restriction hole larger.
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Old 01-24-2022, 06:51 AM   #8
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Thank you, I removed the shower head and just turned the hot water on. Still same. Hot water heater did not kick on. Turn on the sink and it did. Shower head is not the issue.
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Old 01-24-2022, 08:05 AM   #9
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Thank you, I removed the shower head and just turned the hot water on. Still same. Hot water heater did not kick on. Turn on the sink and it did. Shower head is not the issue.
Next I would check the shower hot water valve, diverter mechanism, and shower head hose connection if you have one. Some have restrictors/screens in them.
If all is clear, start looking for kinked pex lines.
If all else fails, call Girard tech support.
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Old 02-01-2022, 08:30 AM   #10
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Good morning, wanted to thank you guys for your advice and input. I put a regulator with a pressure gauge and removed the water filter and my shower hot water came on immediately and had more pressure.
It was 100% pressure related.

Thank you
Jack Fuller
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Old 02-01-2022, 09:27 AM   #11
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Good morning, wanted to thank you guys for your advice and input. I put a regulator with a pressure gauge and removed the water filter and my shower hot water came on immediately and had more pressure.

It was 100% pressure related.



Thank you

Jack Fuller
Good deal.

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Old 02-01-2022, 06:53 PM   #12
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Since the problem stopped when filter was removed it's highly likely the filter was clogged.
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