Hot water temp control for boiler?

[Mark42]

Is there an "automatic" mixing valve that can be installed on my boiler to keep the hot tap water at a preset temperature? <br /><br />My boiler has a coil in it for hot tap water. There is a cold water bypass (with simple gate valve) that mixes cold in the hot output side to lower the temp. <br /><br />Looking for a better solution to this OEM setup.

 

[rickdb1boat]

Re: Hot water temp control for boiler?

Hi Mark<br /><br />Don't see why you couldn't install a thermostatic anti-scald mixing valve inline at the boiler. Similar to what you would use off a hot water heater line. That would take care of it automatically. Just a thought...

 

[Paul Moir]

Re: Hot water temp control for boiler?

Hydronic heating is very popular here, so there are also lots of those tankless hot water coil setups. All the systems I've seen use a device called a Tempering Valve, which works exactly like that anti-scalding valve Rick is talking about.<br />

<br />You usually see them cranked all the way to "hot" and most systems have a flow regulator (flow restrictor) built into the hot end to keep the resupply of hot water sufficient. It looks like a large pipe coupling, but it'll have x.xGPM stamped into it. A lot of people opt to instead use an electric tank (using the old coil for pre-heating) or one of those recirculating tank setups. If you go down that road, be sure to find and remove the flow regulator so you can get decent "pressure" on your shower.

 

[Mark42]

Re: Hot water temp control for boiler?

Thanks guys! That tempering valve is what I'm looking for. <br /><br />Need to keep the hot water temp down so the little ones don't get scalded (and there is a temp control in the tub/shower valve) and keep the older one and the guests from steaming the crap out of the bathroom before getting into the shower. Not to mention the $$$ just going right down the drain while they heat the bathroom with the steam....