Hello all,am desperately worried that I've made an error somewhere. As is theway, I thought I'd gone by the book, but it appears I may have overlooked something. If it was anything other than gas then I wouldn't be'too' concerned, but...I very recently replaced the gas hob that was in this house when wepurchased it. At the same time I removed some of the old gas piping(had very small leaks behind the oven and was way out of spec). The oldgas pipe didn't have an isolation valve and had a very small leak.In the new system I fitted an isolation valve, replaced the hoseconnection with a soldered joint and removed about 5 straight throughconnectors and elbows to replace with a nice clean straight run.The problem now is that when the combi boiler fires for water orheating the hob flames get smaller. On individual rings it's not reallynoticeable, but on the large centre ring it's quite significant.I've checked the isolation valves on the boiler and hob and they'reboth open full, I've also checked the valve on the gas meter and thattoo is fully open. There aren't any other gas appliances in this house.Have I done something wrong? and what can I do to rectify this?Thanks as ever for any and all advice.Seri

Firstly if its a fixed hob this should be fitted by a registered CORGI fitter, but presume you knew that. I must admit we do notice a slight decrease in flam on the gas cooker when the boiler comes on but think its due to the fact the boiler has a greater requirement for gas and is comes before the hob in the pipe work.Don't think its anything to worry about, unless your hob goes out everytime your boiler starts but that's only my opinion.

On Sun, 18 Dec 2022 13:28:01 +0000, John Rumm wrote:Or coal gas! :-)

Brian Gaff wroteThere is no such animal.

When boiler fires hob flames go down

Dec 15, 2004 Last reply: 3 years ago 26 Replies

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Andrew 3 years ago

18 years later ....

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Brian Gaff 3 years ago

Yes well, its about time those in charge of allowing access to usenet to house that jack built type web forums was cut.

Brian

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John Rumm 3 years ago

Natural gas or LPG?

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Chris Hogg 3 years ago

Or coal gas! :-)

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Rod Speed 3 years ago

Brian Gaff snipped-for-privacy@gmail.com wrote

There is no such animal.

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Animal 3 years ago

you've got a troll stuck in the pipe

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Andrew Gabriel 3 years ago

Make sure all dirt cleaned off hob burners, particularly from the holes/groves. If they're partially blocked, gas velocity will be incorrect which often causes lighting problems, and flame lift-off.

If that doesn't fix it, you need a gas engineer to check the gas pressure, and pressure drop under load, and maybe adjust the hob burner rates. One appliance significantly affecting the pressure at another appliance might suggest undersized pipework, gas regulator not working correctly, or insufficient gas supply.

Andrew

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