Heatilator& Heat-N-Glo Propane Gas Pilot Assembly 4021-737

I bought this pilot assembly because pilot assemblies for the Stardance DV25 are no longer available and my stove got completely fouled by insects that hatched from acorns that woodpeckers gloriously dropped down the flue.Lesson 1: Don't let those acorns the woodpeckers have blessed you with sit in the stove past the winter. The insect hatch from worms in the acorns will be a mess that will ruin your stove and you will wonder where all the insects in your house are coming from in the summer.If you are skilled with a vice and a Dremel you can open up the two mounting holes/slots and make this unit fit the DV25 stove. Clearances must be such that it drops in without any interference and the screws go in with no effort. You may need to relieve interference between the cast iron and the sheet steel around the ceramic ignitor, but I got it to slip in by suitably slotting the two screw mounting holes. Failing to do that and trying to force it in with the screws will mess up the threads, at least on the screws, don't ask me how I know this. Don't forget to use a new gasket which you may have to cut from appropriate material. Bolted in, this pilot assembly clears the logs as nicely as the original DV25 one.The thermopile that provides electricity to operate the gas valve will hook up to the DV25 stove and in fact will go into the old pilot assembly of the DV25. Don't over tighten this, its only for mounting the thermopile, snug does it. A prior service person over tightened mine and mashed the nut a bit, making it a pain to get out.The thing that is miss-named "thermocouple", but is really more of a thermometer in function: bulb, copper capillary and then the expanding end that actuates the gas valve to keep the pilot lit, is again a direct exchange between the old DV25 pilot assembly and this one. Keep using the old one if it still works and you don't have to worry about making the careful bends of the copper capillary tube to install the new one. Again, don't over tighten this, it is only a mechanical mounting, not a gas connection.Use needle nose pliers to give the push on connection a twist back and forth while pulling the high voltage connection from the piezo device. Break this connection by yanking on the wire itself and you will need a new pilot assembly. Use the same trick with needle nose pliers to push it back on. Don't push it on by the wire, you will mangle the wire.The last item is the gas line for the pilot and that is where the show stopped for me, at least until another time. The dimensions of the sheet steel pilot "hat" are not the same as the DV25 part that you can't get anymore. The new pilot itself seems like a nice design, with a single barrel and two holes at the base to pickup air at the base. The sheet metal pilot orifice from the DV25 will not fit this assembly and the 1/4 inch aluminum pilot line will not be usable with the new pilot. To make it work, you have to pull the 1/4 inch pilot line and see if the new pilot line fitting will go into the gas control valve and seal properly. This required a crow foot wrench I did not have (right now, but I will order same) and I did not want to destroy the old line to get it out and try the new one. The advantage of the new pilot design is that some compressed air applied to the little vent holes at its base will blow it clean without any disassembly. This can save a lot of work if the pilot is fouled.Necessity forced me to look at the old pilot assembly again now that it was out of the stove. Its pilot is two concentric tubes. The outer one brings air down to mix with gas and go up the inner one. Some compressed air and poking cleared it of bug fouling. It went back into the stove and worked fine. Remember to get the sheet metal pilot back in there and check its little hole first for fouling with by shining a flashlight from the back side. The injector that feeds gas to the main burner can also be fouled as mine was. It comes right out and you can clean it of any obstruction. It is right hand thread. I used LOCTITE 577 gas sealant on this part, which matched the hardened sealant that was on it when it came out. Do not over tighten it putting it back in, it is a small brass thread that is easily stripped. A new replacement injector may be available, but then again, maybe not.Lesson 2: With only the possibility that the ceramic mounted high voltage line from the piezo might crack, or the possibility that the connection to the piezo may break if you miss-handle it, the actual pilot unit will likely never go bad. A cleaning and it is as good as new. This goes even for a 25 year old unit.When hooking the pilot line back up sealant on the threads does nothing for you, the gas seal is a metal to metal seal inside the assembly. Tighten it, but there is nothing to swage like a normal compression fitting. Any sealant on the metal to metal seal and you won't get it out the next time you want to service it.The thermopile and the "thermocouple" are available separately at low cost. You need this pilot assembly only if the high voltage line or ceramic mount for the spark electrode is bad. This sort of service is recommended only for very experienced gas heater technicians, and the ones that serviced my stove for the previous owner weren't.I have no complaint at all with this seller. They said what stove the pilot assembly was for and it arrived, promptly, well packaged and in perfect unopened condition. Who knows, I may have to use the sheet metal pilot assembly some day. I would buy from this seller again, and will likely buy another pilot assembly to put away just in case..*** Disclaimer: I would never trust a gas technician to do this type of work. The fittings on my 25 year old stove indicate that the technicians who worked on it in the past were trainees (at best) who wrenched on things improperly and perhaps didn't know which way to turn the wrench. If you try to do anything described here you might make a mistake, fail to notice a significant problem, and likely catch your house on fire. I am not responsible for that possibility. ***

Works like it should. At first I tried the kind with the round burner, which cost 3x as much. On windy days it would blow out. No problems with this one. At less than $35, it’s a good value.

simple plug and play replacement with the OEM version. the fireplace works again.

This was a great fit for my fireplace

Good product worked great

The assembly works perfectly and I saved anywhere from $85 to $100 with quotes from dealers and contractors (not to mention labor costs). Fairly easy to install with common wrenches and screwdrivers if you take your time.

After spending over an hour to install this, for some reason the pilot light thermocouple seems to cut off the gas within 10 minutes of the unit being turned on.

I knew two things when I started looking for a replacement standing pilot unit for our Heatilator gas fireplace. First, I knew that the thermocouple was broken: I could see that. Second, I knew where to find the installation manual for fireplace.The manual is crucial for determining exactly which part number is needed. If you don't have a manual, find one before you order any parts. You need to be sure that you're getting the correct part for your particular fireplace.The unit arrived in clean packaging and obvious factory-new condition. Installation went well; it took me a couple of hours, but I went slow since I've never fixed my fireplace before. I've only watched a trained technician do this job before. I also took advantage of online video tutorials and watched all I could find.Excellent price; I found this unit to be less expensive from Amazon than from any other online dealer I could find.