starting to piece together my fresh water system. i can use some help o be sure i am on the right path. search function was too broad when using "water system". google returns are all over the place.
so far, i have come up with the following:
fresh water tank (15-20 gallon size).
fitting on bottom of tank with ball valve ----> goes to water pump
water pump, shurflo 12v. ------> goes to "manifold" or splitter (need help on this)
manifold splits supply to cold water valve on sink faucet and hot water heater inlet.
hot water heater will be small 4 gallon electric tank (this type and model works for my application)----->hot water then goes to hot water valve on sink faucet.
the fresh water tank will have a vent located near the top to equalize pressure when filling
the fresh water tank will have a fitting that leads to a fill port installed on the side wall of the van.
i plan to use hose connections (good quality) from the fill port to the fill fitting on the tank so that i can install an inline filter to clean the water before it enters my tank. my water supply is very high pressure and the flow is high.
i will have on-hand, a pressure reducer (connects to hose) and the water filter mentioned above allows for a flow of 5gpm.
although my parking arrangement includes a water connection, i will not be connected to in all the time like a city water connection. i will connect only to fill.
my questions are as follows:
do i need some sort of check valve to ensure that the water supply going into the heater does not back up into the system? something between the "manifold" and the heater?
i plan on using pex for everything other than the "fill side"...any suggestions? i know there are a few types of pex fittings. i prefer one that does not require a billion dollar tool.
i plan on using brass valves and i picture the "manifold" being brass as well. if i can avoid soldering i will. but i am comfortable with light soldering of copper. dont have anything hot enough for brass around like mapp gas or whatever it is.
on the waste side..i already have a design for that.
any help on the supply side would be grateful...i feel like i am missing something.