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Question DetailsAsked on 11/20/2017

Cost to replace gas valve thermocouple and pilot assembly for gas boiler

My pilot light on gas boiler was out. Need a gas valve thermocouple and pilot assembly. What should this cost?

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Generally, you would not need the whole pilot assembly unless it was physically damaged, the gas tubing to it was leaking (though usually that is replaceable by itself or just make up a new piece of tubing), or it was badly corroded. For the whole assembly - rarely in the $20-30 range, more commonly in the $40-100 range, can be as high as $250 with a few uncommon brands.


The thermocouple itself (usual cause of this) typically about $5-15 but some come only with the pilot assembly (without the pilot gas tube) for about $30-60.


If you have a thermopile rather than a thermocouple (normally with gas control valves which have LED indicator lights - a thermocouple puts out more power than a thermocouple) more like $40-70, sometimes as much as around $100 give or take for the part - labor the same for any of these.


Plus typically $75-150 service charge for the visit (should take less than 1/2 hour to install and test on any unit I have seen) - a very few very high priced large city suburbs the trip charge (including first 1/2 - 1 hour of work) can run into the $150-300 range, but that is rare.


One thing you run into is if your boiler does not already have secondary high limit "aquastat" emergency shutoff he may say you need that to comply with code in your area - commonly about $75-200 for the device itself (which clamps to the outgoing manifold pipe from the boiler and connects to intercept the power to the control box) - labor should be none to maybe $50 more than above if done at same time - only takes about 5 minutes in most cases to install. Looks like this typically:


http://www.supplyhouse.com/Honeywell-...

Answered 12 months ago by LCD




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