Does our new to us abbey freestyle 470se (2004) have an on board water tank

Question edited for clarity and spelling of 'Abbey'. Not sure why it had .COM at the end, but removed it as it made it look spammy? :>D
Question moved from Cars and Trucks to RVs.

Check the link, you didn't provide a model number, just GTS and year, so I chose the Abbey 419. My mother had a couple of Abbey Caravans, very high quality.

https://www.google.com/search?q=ABBEY+GTS+2008+user+guide

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google not your friend
your dealer will no help you, the place bought it new?
no Caravan's in USA so..

found this

My 2004 Bay 34XB also has a 2 FW tanks=84 gallons setup that requires the sidewall manual water fill cap be opened in order to vent properly to fill the 2nd tank. Perhaps yours is similar. Weight distribution on this model places them aft of the front axle. My tanks are under the salon area, just behind my battery box / entry steps.

I also have a drain **** located between the 2 tanks for draining both at once. There is a circular cut-out hand access hole in the wall of the basement plenum [to operate the valve]. Located 1st basement box aft of the steps. With a mirror you can peer into the plenum and see edges of both tanks. they are perhaps 8-10 inches apart. This should help you find them.

https://www.google.com/search?q=2009+Tiffin+Allegro+Bay+fresh+water+tanks

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I don't know what you will use, but when I am dry camping, my combined black and grey water tanks hold twice the fresh water tank capacity. SO: .... to fill it, I got a NEW 5 gallon yellow (diesel) plastic fuel tank('can') ..... (caution: do not put fuel into it), and used a drill pump (available for less than $8.00 from Harbor Freight) to pump fresh water from the 5 gallon 'can' into the fresh tank. repeat until filled. Since we live fulltime in a 5th wheel, I have my tools with me all the time.

buying a new, unused fuel container (5 gallon) , ensures no fuel contamination of your fresh water supply and tank. ALSO: get a NEW drill pump and do NOT use it for waste water or other fluids, keep in a small container for fresh water use ONLY..... recommend you let it dry thoroughly after each use.

There must be a water shut off valve between the tank and the water pump. One of those hook ups will be for city water that goes direct to your tap and the other inlet is to fill the on board tank. Again check for shut off valves.

problem is there is an RV for your system. you will need to do the following.
Drain all holding tanks, fresh water and sewage

1. Attach garden hose to fresh water fill and fill tank.
2. Turn on pump switch and open cold water side of all faucet/ shower fixtures. Leave open until water runs clear. Repeat for hot water side.
3. Flush toilet until clear water runs into bowl.
4. Dump tanks again.
5. Sanitize water system. use a water sanitizer
6. If a water filter is installed, drain lines, remove filter assembly, clean and reinstall with new filter.
7. When ready to use the water heater, turn by-pass valve to open position to allow water to enter and fill the hot water heater tank.

Should be a low point drain near the tank fill area underneath the trailer.

Many RVs have the plumbing to fill the fresh water tank from the city water hook up. This valve is usually near the city water hook up and labeling is similar to "city water" and "tank fill". Another anomaly from leaving the valve in the "tank fill" position is that, when not connected to city water, the on board pump may run continuously and the water volume is very low.

Greetings and good health to you.
Ok, so I'm guessing by low you mean quantity and not temp, correct?
Does the cold water sputter as well? If so, most likely bad pump but we'll go with it just being the hot water for now.
Does the hot water act the same way on the other sink faucets? If not, the hot water is flowing freely without sputter, the problem will most likely be in the tub's hot water valve (knob) or the shower attachment. You can replace these rather easily.
If your hot water is low in quantity and sputtering only on the hot, then your hot water tank is not getting enough water to it which will cause it to be "low" and sputter as there isn't any water in there to pull from. If this is the case, we need to figure out what is causing the hot water tank to not have water in it.
Your pump is obviously working as you are only having issues with the hot water. Since using the hot water would normally use what hot water is sitting in the tank and thus pull in fresh water to heat up as the hot water exits. This would be the case if you are using the on board water storage and not hooked up to a hose for your water supply.
So, if this is the case, we need to find out where/why the water is not drawing in from the water storage to the hot water tank. First off, locate both tanks and make sure there isn't a valve on the water line that may be turned off or almost off. Check those water lines for any breakage or leaks. If not, if there are two lines coming out of the water storage, one for the cold and the other for the hot, see if you can notice anything in the water tank that may be blocking the "hot" line.
If all that is well, lets look at the water heater itself. I'm guess you would have noticed if this was leaking which is why I waited until now to bring it up. If you go outside and open the panel, does it look like it could have been leaking? Look at the plug (this is where your heating element is located) at the bottom center of the tank. Does it feel damp or can you see streaks going down from there? If unsure, hook up your hose to the water intake and turn it on. Watch the tank from the outside and see if it starts leaking. If it does, bad plug (heating element) easy and cheap to replace.
Once you see there is no leaking coming from the hot water tank, lets take out the heating element to make sure it is filling up. First shut off the water flow. You'll need a large adjustable wrench or if you happen to have that big of a socket, go for it. Remove the element. Water should start coming out as you unscrew it. Once you remove the element, water should flow freely out until empty.
Now, with the plug out, turn the water back on and see if it flows out of the tank. This will show flow is good up to this point.
Ok, so if there are no leaks thus far and the hot water tank is filling up when you hook up a hose, then we need to look and the connection line going from the tank to the rest of the faucets. Put the plug back in. Turn the water on again and follow the lines from the tank to the faucets looking for leaks.
Once you do all this, you should have an idea of what is happening where and possibly how to fix it.
Let me know how it turns out.

Should be at base of tank. Crawl under and look for small 1/2 hose pointing straight down. This should be the drain line. Follow it back to the tank. Valve will be there somewhere.