Be aware that for the first few minutes after turning off you will get the shower head leak a little. This is because the shower head has a large cavity inside that fills up with water in use. When you turn off, that water has to go somewhere, so it dribbles through the outlets of the shower head.
If both shower heads are off no water should be going to your shower head. the only thing it could be is your shower valve itself. you probably have a pinhole in one of your o rings on the valve stem. try replacing the valve stems.
I would start by replacing all the washers and o-rings on the hot and cold valves ( a lot cheaper than replacing the entire valve stem ).
Try replacing the Valves, and then the pipe holders, (for want of a better word) to the wall.
The shower diverter has a bad seal - very easy to replace.
i found a great website for discount shower heads, but it also has a great support section with step by step pictures and instructions.
www.showerstore.com
it has several ideas, including wrapping the threads on the arm with Teflon tape. check it out.
You might want to replace your seats inside the body of the faucet. You can pick up a seat wrench at any Home Depot or Plumbing supply house. Burrs on the seats casue your washers to get cut and, inturn, they cause the faucet to leak. If that doesnt work, chances are that you have a hairlne fracture by the threading of your seat. This means that you should install a new faucet.
Repair or replace the shower divertor
If the faucet contains the re-direction valve (closes off the water from the faucet and redirects the water to the shower head) you need to rotate the faucet counter clock wise to unscrew it from the plumbing and replace it with a new one. Take the old one to your local box store and they can match it up for you.
have your heater core checked its probually leaking
they both distribute water
That's the way they are designed. Most people do not want both at same time.
if it is lowering oil and water both and is not leaking it may have a blown head gasket and it is going out the tailpipe
Yes, yes they do reduce water consumption. Also, much like a filter for your tap water, it will help to offer cleaner water in the shower for both your water and hair.
May be build up in the valve itself or the shower head.
There may have been some water left in the heater core when you disconnected both hoses at the firewall. I can't think of any other explanation since there is no water circulating through the heater core.
A Bristan Thermo Mixer Shower head is specified by its thermal options. It is for both hot or cold water, the hot water is just easier for this type of shower head to be used.
It is not completely clear whether one is wanting to know what a steam shower will do for someone or how these physically work. A steam shower produces steam that is both soothing and exhilarating. The way it works is through a steam generator that heats water to a boil and then releases hot vapor to fill the stall with moisture. This has proven to be very good for skin and sinuses.
Remove the shower head on the shower and see if it is plugged. Run the water with the shower head off and see if the pressure is better. Depending on where you live there may be a water saving feature on the shower head (mandated by law) for water consevation. Low flow shower heads often have a restricter in them. Delta has a brass washer with a very tiny hole in it and Moen has a rubber plug with 3 small holes in it.
Bridal shower is mainly for the bride while the engagement party is mainly for both. Go with a Shower Dance, both sexes can attend :)