Domestic water ?
Do you have water heater ( tank ) ? Or is this combined with your heating system also ?
Any numbers you can give me on the equipment will be very helpful..
Instructions for uploading a photo.
1.) If you see a tree icon in your tool bar at the top of the reply box ( where you are typing ) go to number 2 .
If you don't see one then press show tool bar on the upper left of the reply box and then go to number 2.
2.) Press the tree icon, you should get a window that has a browse button option on it.
3.) Press the browse button on this box. You should then get a second box with a browse button on it.
4.) Press the browse button in this second box and you should get a window that you can use to navigate to the location of the photo file on your computer.
5.) Make your choice of photo file by double clicking on it. The choice box should disappear and the path to the photo file should now appear in the box.
6.) Now press the OK button on that box. That box should disappear and the path name should show up in the first box now. If it doesn't show right away give at least one full minute.
Don't press the insert button until you see a path name in the box. It will only show up as a red x if you do.
7.) Press the insert button on that box once the file path appears.
That should do it. If you still can't do it. Reply back and let me know what point you get to when it fails.
Can you go this site and look at the third one up from the bottom and see if that face-plate resembles something that may may be attached to your boiler. That is the type of exchanger we are looking for , you won't be able to see the copper coil just the plate with the two pipe connections on it. Your cold water line form the house water should be connected to one of them.
Then if you find it , if you could take a photo of that it would be great.