SWMBO wants an inset Gas fire for the lounge. We know about flue
types, fuel types etc but there is still a bewildering choice of
Are they any makes to prefer or avoid? Is having a slide control (or
remote control) worth it? Anything else that we should take into
Yep, the constant 1kW you will lose up the flue when the fire isn't
 Actually I think that is the estimate for a moderately sized
conventional chimney so a gas fire flue opening may be less but
certainly not trivial.
My mother has two gas fires - one open flue, the other room-sealed
balanced flue. The losses from the open flue are very noticeable. I
suspect that she overall loses more from the flue than she gains from
the fire - i.e. by losing warm room air when fire is off as well as what
is drawn in when burning.
My choice would a room-sealed device.
In the south, I had excellent parts service and helpful attitude from:
As usual, no connection except...
No. It's an internal wall with an extant fireplace. I believe the
high efficiency models should not lose too much heat up the chimney,
since they claim in excess of 80% effeciency. They do have heat
exchangers to extract heat from the flu gasses.
I would expect a room-sealed fire to be exceedingly expensive too and
quite complicated. I can't find any price lists ATM.
Anyway, anything would be better than now, where we just have an empty
hole in the wall. It used to house a backboiler but the boiler has
been relocated elsewhere.
Might be 80% efficient in terms of "when burning gas, 80% of the heat
gets pushed into the room". That, I feel sure, does not allow for "when
switched off, considerable amounts of warmed air are drawn up the
chimney which requires the background central heating to be running
(much?) more of the time".
Prices? I do not know - the one I know was fitted an awfully long time ago.
I would hope that the efficiency rating would include any such losses.
Looking at the design of some HE models the path for air to be drawn
from the room and up the chimney is quite long and restricted.
Anyhow I can't imagine it being any worse then now since the room air
can escape up the chimney with no restriction at all.
How can the efficiency rating possibly allow for that?
Imagine, a room with such a heater, and it is used for one hour in the year.
And a second room where the heater is used 24/7/365.
In the first room, even if the loss were tiny, it would very likely make
the efficiency negative (compared to a blocked off flue).
In the second room, it might get near the claimed peak efficiency.
The reality will be somewhere between the two. And they cannot know how
much use you will make of the heater so cannot make allowance in their
It doesn't matter how much use the fire has. The efficiency can be
measured simply: Hear output into room/total energy used. Any losses
up the chimney would be part of this equation.
When not in use efficiency has no meaning since no gas is being
We fitted a room sealed Paragon Focus HE into an existing
16" alcove with a conventional chimney, several winters ago,
replacing an old open flue gas fire and haven't regretted
it. It wasn't the cheapest option, but has proved it was
worth the extra expense. We got it from a local gas
appliance supplier and the manufacturer's site is
We chose the slide control option since the type at the
bottom means you have to remove the "grate" to use it. The
mechanism needs to be kept clean or the battery spark
control fails to switch the spark on.
I have called paragon fire about this model. They were very helpful
but were not able to tell me what the losses might be when the fire is
off, except that they will be less than having no fire at all.
(='.'=) If a man stands in a forest and no woman is around
Yes, it's on now almost as low as it goes, keeping this 6x4m
room warm when the CH is off during the day. When on full,
from cold, it heats the room quickly, much better than the
previous open coal-effect gas fire it replaced. In use, it
seems the advertised reduction in room air changes is
factual... I'm thinking of replacing the open gas fire in
another room with a similar model.
Do they not have a damper to close the flue when not in use? All the
open fires, gas or wood-burning, I used in the US had a closable damper,
which it was very advisable to remember to open when the fire was used
again! Some were operated by a hanging chain, some by a rotating rod,
some by a lever.
They do not appear to have allowed that in relation to ventilation for
an open boiler. Would not seem impossible to have some interlink
mechanism to allow the wall vent to be closed when boiler is off, but it
is not allowed. I suspect things like "fail safe" are not easy or
inexpensive to achieve.
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