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We checked that and no error codes. thanks

Can anyone tell us why our water heater is making this sound?

just an update, if i didnt say so already, we have the pump plugged in full time and all hot water locations in the house are functioning perfectly with very hot water.

is this what i need? https://www.homedepot.com/p/SharkBite-1-2-in-Brass-Push-to-Connect-Ball-Valve-22222-0000LF/202270642?MERCH=REC-_-PIPHorizontal2_rr-_-205744773-_-202270642-_-N

will do. how hard of an install will this be? im pretty handy but have no experience with pex work. where do i need to shut the water off to do this work?

thanks james. would i install the check valve in between the heater and the pump or on outflow out of the pump?

you would think the sharkbite valve fixes it? an update, plugging in the pump seems to fix the issue. however, im not seeing that as a long term fix as I dont desire to pay the gas bill, or void the warranty on my THWH. the condensation drain is not an ideal install either, it sags in the...

im not sure how i go about isolating the pump. the pump and the water heater are directly beneath the master bathroom. any suggestions on how to move forward besides raising the temp are appreciated. we are going to try and raise the temp and see if that fixes the time it takes to heat up as...

thank you for all the information, its great that there is this forum for those who do not have any expertise but are willing to learn and try to do things for themselves. it sounds like

thats too funny! why do you say that? what has been done in error?

the pump is disconnected at this time.

so it looks like a 3/4 inch gas pipe into the system and it is the last unit on the system but only the oven, stovetop, and fireplace are gas in the house. here are some pictures of the system and what we are dealing with.

after doing some additional research I see that the RUC98 does have a built in circulator pump, why would there then be two installed in the water system of the house?

the faucets arent far from the tankless unit. the unit is right under the master bath and it takes a solid minute for the water to heat up. additionally, the unit is set at 120F and the water doesnt even come close to reaching that temp, as you can stand under the shower head with it on full...

My tankless water heater is a Rinnai RUC 98.

Im hoping someone can help. We just purchased a home with a tankless water heater (natural gas) and the water takes a long time to get hot. There is an Grundfos Alpha1 circulator pump that ties into the hot water line next to the water heater in the crawlspace but it isnt plugged in. Could...