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Need Radiant Heat service recommendation in Walnut Creek

5 replies [Last post]
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Joined: Oct 7 2011

Has anyone found a company that will service radiant heat systems in the East Bay?  We don't want or need a new boiler, just a new thermostat and advice for optimizing its performance.  Please email me at .  Thanks!

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Joined: Oct 7 2011

Thanks everyone for your advice.  Let me give you a little more background on our troubles and maybe you can help us solve the problem without the need for a pro.  We are trying to install a programmable thermostat for our boiler.  The difficulties are:

1.  The existing thermostat and circuit is 120volt 2 wire control. We purchased an Aube TH106 programmable to accomodate. 

2.  The Aube requires a minimum of 2.0 amp load = 60 ohm = 240 watt. Our Boiler has 1.5 amp load. The thermostat has internal protection that keeps it from operating under low load.

3.   Seems we need an additional >0.5 amp = >60 watts on the load side of the thermostat. To test this, we wired in a 100 watt lamp and the thermostat worked fine. We have looked for a resistor online that we could use in place of the Rube Goldberg lamp, but have had no luck.

Any thoughts on increasing the load side resistance on thethermostat?

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Joined: Apr 19 2007

the honeywell rth230B worked/s well for our old teledyne boiler as well as our new triangle tube. for $25 you might solve your problem more easily than macgyvering your existing one or calling in a pro.

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Joined: Oct 7 2011

Thanks much.

The honeywell model rth230B  is 24 volt rather than 120 volt. That seems to be the problem we are having. There are many non-programable 120-240 volt thermostats and a few programmable thermostats that are 120 or 240 volt. The later are designed to carry higher load than our system has.

The objective is programmable.

We've recently found your website. Thanks for your efforts to share information.

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Joined: Apr 19 2007

weird. what kind of boiler do you have? thermo lead wires? i know the RSM models pre-date our own by about a half-dozen years, but our thermo wire is literally the same as our door-bell wire -- a brown, flat, 4-lead wire (the thermo and bell only use 2 of the 4, which is convenient if one of the in-use wires craps out, just clip/strip and try one of the unused ones)... the wires themselves being /maybe/ 18 gauge, but more like 22 (and in no way can carry any meaningful voltage). the mercury switch in the old thermo was meant to only complete the circuit and presumably trip a servo or something on the other end. the old R2D2 boilers (AOSmith?) used the same setup... if you're looking for a pro, our own favorite rhymes with "sanderson". ;) ... good luck.

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Joined: Dec 19 2010

I wonder if someone bypassed your original transformer and hardwired it to 110v.  If that's the case, you want to change that asap because that can't be good.

Pull your thermostat off the wall and see what kind of wire goes into it.  If it's Romex (12-14ga) then it's OK, but if you see 18ga or smaller (I think the thermostat wire is 22ga) then time for further digging.  You have my email if you need it.

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