I have a woodgun which has a domestic coil. The boiler temp varies from 220 down to 140 or less when the fire is out. I want to install some sort of tempering valve to regulate the domestic hot water temp so nobody gets scald. Are these valves dependant on incoming temperatures or is the output constant as long as the incoming is above the output?
domestic tempering valve
- Thread starter mark123
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You can get them to fit both situations that you mention, however, what you are looking for is a Honeywell AM-1 series thermostatic mixing valve, set the temperature and forget, I do recommend a couple times a year you adjust the valve up and down just to keep things inside free and working properly. My area they are about $80CAD at the wholesalers, although I have found new ones for less than $50 shipped on ebay.
I Know the one I have fluctuates some with the different boiler temps. It's not enough for me to worry about though.
I only go to 200 max so it may vary more for you.
I only go to 200 max so it may vary more for you.
surviverguy
New Member
- Mar 19, 2012
- 99
The tempering or anti scald valve has three ports. The ports are cold, hot and mix. The valves are adjustable. When the hot water going into the valve is higher than the set temperature, cold water is blended in to create the (cooled) mix. These valves are great for peace of mind to prevent scalding (burning skin from hot water). For this application the valve would be installed after the hot water heater or storage tank. It won't affect the boiler temperatures. Be sure to get one for potable water because they are also available for heating applications as thermostatic mixing valves. The heating type should never be used with domestic water.The Honeywell AM-1 is appropriate for your application. You should set the valve somewhere between 120 F. min and 130F. max.
He's asking if the dhw temp fluctuates with different boiler temps. In my case yes it does some.
I would recomend buying a good one, as many of the cheap ones "fluctuate" or fail to work with low flow rates. The good units will state minimum flow rates of operation, symons , taco, conbraco, wilkins zurn, honeywell are good brands. Also reread morgans post as it is very helpful in keeping good operation. Scale seems to be a problem in some water conditions.
Also make sure the one you order has an appropriate temp range for your application. You can order them with a max output of 120 or 145 or 180.
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