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Posted by Heatpro on December 26, 2005 at 10:52:21:
In Reply to: Re: very little hot water with tankless coil in steam boiler posted by John on December 26, 2005 at 09:48:24:
Yes, before the use of automatic tempering valves, the bypass valve was adjusted to give tempered hot water by mixing some cold at that point. Hopefully, the valve stem would become so corroded that someone couldn't mistakenly close the valve and then turn the low limit down to try to keep the water from getting too hot. The valve was often wired into place to keep from turning after it was set. However, modern litigation makes a manual valve too dangerous for a repairman to set (someone could order hot coffee and then spill it on her lap getting several millions of dollars), as he would take responsibility for scalds, so an automatic tempering valve serves the purpose.