Gas fired poker boiler design

Gas fired poker boiler design

This topic has 3 replies, 4 voices, and was last updated 31 January 2026 at 08:55 by Engine Builder.

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21 January 2026 at 10:09 #833389
michael howarth 1
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@michaelhowarth1
My latest venture is building a Gauge1 4-6-2 loco which I would like to fire with an LPG poker burner. Why? because I have not tried out this method as yet and as a bonus it seems to be a relatively simple way of powering a loco. My problem lies in finding a formula for flue(s) sizes and burner size.

When using alcohol as fuel I have found that the general rule of flue tubes being no longer than 20 times the diameter, flue area of about 1/2″ squared and a heating surface of about 45 sq. ins was about right for medium size locos.

My current project has a boiler 11″ x 2 3/16″ so is a little bit larger than medium size. I am somewhat reluctant to embark on a suck it and see experiment. Any advice from the Forum will be greatly appreciated.

Mick
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21 January 2026 at 11:39 #833411
noel shelley
Participant
@noelshelley55608
At one point I was looking at gas firing and gathered up a collection of water heater burners with a view to adapting them by using the thin metal with all the little holes in to make burners and then experiment with jets and air both primary and secondary. Good Luck. Noel.
30 January 2026 at 22:16 #835011
Colin Teasdale
Participant
@colinteasdale
Not sure whether it is a gas poker burner, but the Gauge 1 Association ARM1G loco is gas fired. Just the Ticket, other suppliers are available, should be able to give you more info if you need it.
31 January 2026 at 08:55 #835033
Engine Builder
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@enginebuilder
https://youtu.be/wVPtU-Lualw

The boiler in this model is a similar size to yours. I have made a few like this. The flue needs to be 1″ OD diameter.
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