flow restricter to moderate water temp

[trane]

I have daughter and son in law with a oil fired hot water boiler in LI NY under service contract with a oil co. It generates hot water via a tankless coil that initially allows the hot water to flow at a scalding temp @ full pressure 55-60 psi! Very dangerous for adults but now there is now a brand new 5 week old female grand child now in the home(needless to say cute as a button) and no cross connection with the cold water inlet to even make and attempt to moderate the temperature it is a potential disaster waiting to happen!. We live in Florida and only visit. I suggested that he contact the oil Co Supervisor and ask if he could remedy this dangerous condition. Starting out with a new baby needless to say there is not a hole lot of extra bucks lying around to do it right, so I suggested perhaps he would inquire with the Co that under the contract that at least installing a flow restrictor on the inlet to prevent a tragedy might be the best way to go temporarily. My feeling is they would do it without a thought. My only problem is that being retired 10 years and doing commercial for the 30 before that. I don't remember what they are called and if there even made any longer. Any thoughts would be greatly appreciated!:thinker:

[cgar]

What they need is a mixing valve. It sounds from your post that the hot water comes out the coil and goes straight to the faucets. This is incorrect. The mixing valve takes the hot water from the coil and mixes in cold water. The outlet from the mixing valve should go to the faucets.

Mixing valves are very cheap (I think $30 or so). If a mixing valve does not exist, then the work to install a flow restristor is only slightly less than a mixing vavle. I suggest just going the mixing valve path.

If a mixing valve does exist, then it might just need replacing. There is also the possibility that there is a cutoff valve on the cold water supply to the mixing valve and someone accidentally closed off this valve, so cold water is not mixing in as it should.

This is a fairly simple fix repair. Assuming copper piping, there is just some soldering involved.

[trane]

I did not think of a mixing valve as being a almost as cheap and far better alternative I blocked at the flow restrictor, that's why this site is so invaluable.
The piping is copper but there is absolutely no cross connection of any kind existing between the hot and cold water distribution piping. When a company takes on and account they check the system and either accept all responsibility for the system being correctly installed or reject the account. In this case I believe the system is not code compliant an dangereous