Faced with a bill of £1500 squids to open up a hearth and rebuild a
chimney stack, I'm wondering about a flueless gas fire.
Any comments on how good they are? We've got a rad in the front room,
so there would be some extra warmth in the room which should prevent
any condensation problems which I understand they may have.
And can anyone clarify what a powaflue is - I've seen an nice looking
model which says that whilst it doesn't need a chimney, it does have a
twin walled flue, so I'm wondering where the twin walled flue actually
A good few years ago when I bought a "Cannon Coalridge" balanced flue fire,
there was another model with a "Power Flue". This was for fitting in places
not against an outside wall.
The "power flue" was a rather chunky-looking ISTR white painted probably
metal "skirting board-shaped" pipe that could be run around the room at
floor level just like a rather ugly skirting board. Presumably it eventually
reached a place where it could pop outside. I think there was a fan in the
fire to make it work.
Things may have move on from that - it was a good few years ago.
OK, the following types of flue are available for gas appliances.
1. Flueless. The oxygen comes from the room. The fumes go back into it.
Advantages: Very cheap, simple.
Disadvantages: Possible death. Limited to low power. Requires massive
Examples: Gas hob. Portable gas space heater. Cigarette lighter. Plumbing
2. Open flue. The oxygen comes from the room. The fumes rise up a chimney
flue using convection.
Advantages: Chimney may already exist. Removes combustion products, like CO
and water. Cheap appliances.
Disadvantages: Ventilation still required. Chimney problems may lead to room
contamination. Flue expensive to construct or fix if broken.
Examples: Traditional range cooker. Boiler from 1970s. Traditional gas fire.
3. Balanced flue. The oxygen comes from the flue terminal. The fumes are
ejected from the flue terminal.
Advantages: Room sealed. No specific requirement for ventilation. Cheap flue
Disadvantages: Flue length limited to short horizontal length through wall.
Must be situated against outside wall. More expensive appliance.
Examples: Balanced flue fire. Boiler from 1980s.
4. Fanned flue. The oxygen comes from the flue terminal. The fumes are
ejected from the flue terminal. A fan is used to enhance this process.
Advantages: As balanced flue. Additionally, flue length can be long, and
involve bends and vertical and horizontal sections. More reliable flow than
by convection/expansion alone. Good for high power applications.
Disadvantages: More expensive appliance. Long vertical flues may be more
expensive than an existing open flue. Fan may be noisy.
Examples: Fanned flue fire. Modern boiler.
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