Hello all I am new to the forum as we just purchased a 2022 Grand Design Momentum 351M. I am having problems with the hot water pressure only when the water is hot and not all the time. I currently have my regulator set at 45psi just before going in the nautilus system. Before turning on the water heater I check that both cold and hot have good equal flow. After turning on the water heater later I can go try the hot water and it’s about 50% less pressure. 20min later I can try it again and it’s about 20% less than the cold. All this time the cold water stays at the same pressure never fluctuating. I am currently beyond confused and not getting much from my dealer since they are 8hrs away. Thoughts?
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Matthew.yeoman3 Welcome aboard!! If this happens on multiple faucets, there must be some kind of obstruction in a line coming out of the water heater, which expands with heat. Or a valve on the Nautilus isn't fully open to the correct position. I've never had this happen. Fluctuating water pressure on both hot and cold, yes, when the park is on a well with pump cycling. I usually set my regulator for 60 to 70 psi at the hose bib. The inline hose filter and on board whole house filter both take a chunk out of that pressure.
DaveDave and Darren Bakersfield, CA
2019 GMC Denali dually 4x4 duramax, BW puck hitch, timbrens
2015 Chevrolet 3500 CC duramax SB SRW (much loved; replaced with dually)
2021 Solitude 390 RK-R (3 A/C, solar, gen, 8K axles DP glass), comfort ride shocks, VIN 03584
Max and Riley, our chihuahua/jack russell furbabies
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Originally posted by Matthew.yeoman3 View PostHello all I am new to the forum as we just purchased a 2022 Grand Design Momentum 351M. I am having problems with the hot water pressure only when the water is hot and not all the time. I currently have my regulator set at 45psi just before going in the nautilus system. Before turning on the water heater I check that both cold and hot have good equal flow. After turning on the water heater later I can go try the hot water and it’s about 50% less pressure. 20min later I can try it again and it’s about 20% less than the cold. All this time the cold water stays at the same pressure never fluctuating. I am currently beyond confused and not getting much from my dealer since they are 8hrs away. Thoughts?
BrianBrian & Michelle
2018 Reflection 29RS
2022 Chevy 3500HD
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Originally posted by Matthew.yeoman3 View PostHello all I am new to the forum as we just purchased a 2022 Grand Design Momentum 351M. I am having problems with the hot water pressure only when the water is hot and not all the time. I currently have my regulator set at 45psi just before going in the nautilus system. Before turning on the water heater I check that both cold and hot have good equal flow. After turning on the water heater later I can go try the hot water and it’s about 50% less pressure. 20min later I can try it again and it’s about 20% less than the cold. All this time the cold water stays at the same pressure never fluctuating. I am currently beyond confused and not getting much from my dealer since they are 8hrs away. Thoughts?
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2017 Ford F-350 DRW, '19 315RLTSPlus
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@DarnDave I will give a try to the pressure regulator at the bib who doesn’t like more pressure.
Country Campers we have the 340011 : WATER HEATER SW12DEL 12 GALLON WATER HEATER W/ONE PC GAS VAL.
howson thank you for the link I will be trying this next week before we roll out again.
I have tried all the faucets and they do the same thing. I’m hoping that the check valve or something is a little gummed up at the rear of the tank. I will definitely let y’all know how it ends up.
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Country Campers do you happen to know what threads that should be? 1/2” NPT is what I’m assuming.
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Originally posted by Matthew.yeoman3 View PostCountry Campers do you happen to know what threads that should be? 1/2” NPT is what I’m assuming.
BrianBrian & Michelle
2018 Reflection 29RS
2022 Chevy 3500HD
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Country Campers well it seems to have made a difference. When I took the old check valve out there was nothing in it, so I’m not sure what the problem was.
Why is there a check valve there anyway? I’m assuming so when you turn your system to bypass the water heater you don’t get any bleed back.
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Matthew.yeoman3
Yes the check valve is used to prevent back flow, mostly for winterizing so the tank does no fill with 12 gallons of antifreeze. Anther check you can do is the back of the Nautilus panel for any lines that may be bent too sharp causing a kink, check all lines anywhere you can see them but we have seen a few on the back of the panel. As the water gets hot the kink may close more.
BrianBrian & Michelle
2018 Reflection 29RS
2022 Chevy 3500HD
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Originally posted by Country Campers View PostMatthew.yeoman3
Yes the check valve is used to prevent back flow, mostly for winterizing so the tank does no fill with 12 gallons of antifreeze. Anther check you can do is the back of the Nautilus panel for any lines that may be bent too sharp causing a kink, check all lines anywhere you can see them but we have seen a few on the back of the panel. As the water gets hot the kink may close more.
BrianKen & Sandra
2021 303RLS | 2020 F350 Lariat 6.7L 4x4 SB SRW
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Originally posted by KSC_Travels View Post
Beyond the check valve, since this gets worse over time as the water heats up, I would also be suspicious of the P&T valve and/or the air "dome" or "gap" inside the hot water tank. Check to see if the P&T valve is dripping a lot when the tank heats up. This could indicate a faulty P&T valve. Or it could also mean that the tank does not have the right amount of air inside it. One easy check would be to drain the hot water tank (after first removing water source and pressure and opening the P&T valve - CAUTION WATER WILL BE HOT) and then closing and let it refill again. This should reset the amount of air in the tank.
BrianBrian & Michelle
2018 Reflection 29RS
2022 Chevy 3500HD
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