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Old 11-16-2020, 01:24 PM   #1
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Brand: Thor Motor Coach
Model: Palazzo 37.4
State: North Carolina
Posts: 29
THOR #16500
Low Water Pressure

Our coach has the factory installed Pentair Shurflo Revolution 4008 Series By-Pass Pump. When operating on the pump it does not generate sufficient water pressure to activate the tankless water heater. I have done some research, but can not find any troubleshooting guides. Any thoughts or recommendations for a preferred pump to purchase to swap it out? Thanks, -Rich

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Old 11-16-2020, 02:12 PM   #2
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Brand: Thor Motor Coach
State: Missouri
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THOR #6903
Check your filter and inlet plumbing
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Old 11-16-2020, 02:44 PM   #3
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Brand: Thor Motor Coach
Model: Palazzo 37.4
State: North Carolina
Posts: 29
THOR #16500
Removed the water filter and checked the screen at the pump. I appear to have good pressure on the cold side, but still too weak on the hot side to activate the water heater. Is there a separate screen on the hot side that may be restricting the water flow?
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Old 11-16-2020, 06:21 PM   #4
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Brand: Thor Motor Coach
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THOR #6903
Quote:
Originally Posted by valkosr View Post
Removed the water filter and checked the screen at the pump. I appear to have good pressure on the cold side, but still too weak on the hot side to activate the water heater. Is there a separate screen on the hot side that may be restricting the water flow?
I am not familiar with your water heater, it is possible it has some type screen on the inlet

Might install a pressure gauge and see what psig you are developing
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