Re: Music for Sysadmins...
- From: Jasper Janssen <jasper@xxxxxxxxxxxx>
- Date: Thu, 15 Nov 2007 13:49:16 +0100
On Wed, 14 Nov 2007 19:28:06 +0000 (UTC), brian@xxxxxxxxxxxxxxxx (Brian
to the heat that goes upthe boiler chimney instead of into the water.
The chimney on the gas water heaters I've seen have a number of
baffles in them to transfer the otherwise-waste heat into the water.
In many, the gas ignitian pilot is sufficient to keep the well-insulated
tank warm all day.
High Efficiency condensing gas furnaces (of whatever kind, depending on
what you're heating with 'em) typically can get up to 105-107 percent
efficient, compared to the burn calories in the gas (the rest is the heat
that comes out of the burn reaction as H2O, which I think is used to
preheat the incoming air feed inside the and thus provides extra heat).
The theoretical max available is 111%.
Although they usually don't have a pilot light and use a sparkplug
instead, that's much more efficient all by itself.
In many homes, the water heater is very near
the kitchen, which is where small amounts of hot water are often
demanded, so the pipes are short and little heat is wasted. For
example, the run from the HWH to the kitchen sink is under two
meters, and most of that is enclosed in an insulated wall.
Depending on the situation (mainly 'can I reasonably stash it elsewhere if
at all possible'), a fair few central-heating/hot water combiboilers are
actually in the 'top kitchen cupboard' wallspace right above the sink.
In our house, the combi boiler is in the attic, which is why it only
supplies the 2 bath/shower combos and the bathroom sinks. The kitchen has
a separate 10 liter electric boiler which warms quickly, is fairly small,
and gives you nearly-instant hot water (as opposed to hot water after
you've let 20 liters go down the drain). I suppose we *could* put a gas
fired water heater ('geyser' in Dutch) in the kitchen, but I suspect it
wouldn't really be worth the effort.
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