Water heater tank life
 

Hi,
Under same condition, only comparing tank life, which one would last
longer, natural gas one or electric one?

Water heater tank life
 

On Sep 14, 10:23�pm, Tony Hwang wrote:
Hi,
Under same condition, only comparing tank life, which one would last
longer, natural gas one or electric one?

electrics tend to last longer.

the downside is much lower performance for electric and higher
operating cost

Water heater tank life
 

Water heater tank life
 

"Tony Hwang" wrote in message
...
Hi,
Under same condition, only comparing tank life, which one would last
longer, natural gas one or electric one?

Only tank life, electric has an edge, but it mostly likely will burn out an
element or two along the way. In most places, gas is cheaper to operate and
recovers faster when HW is being used.

Water heater tank life
 

On Sep 14, 9:50*pm, " wrote:
On Sep 14, 10:23 pm, Tony Hwang wrote:

Hi,
Under same condition, only comparing tank life, which one would last
longer, natural gas one or electric one?

electrics tend to last longer.

the downside is much lower performance for electric and higher
operating cost

If cost per btu of both fuels is the same, or nearly, this is not
true. Electric is near 99% efficent, your average gas tank sold is
near 50-65% efficent, with the high end on condensing Ng around 80-85%
total efficency, known and rated as EF. Recovery or performance is
what you buy and need. Gas also loose efficency every year due to
scale buildup that does not affect electric units. And how many ever
have their burner checked to be sure its burning right. A premium
could be paid for electricty and an electric could still be cheaper to
run. Every areas fuel and electric costs are different so run your own
numbers.

Water heater tank life
 

On Sep 15, 8:11*am, Blattus Slafaly
wrote:
Tony Hwang wrote:
Hi,
Under same condition, only comparing tank life, which one would last
longer, natural gas one or electric one?

I have tankless point of use water heaters. I am *wondering how long
they last.

--
Blattus Slafaly *? 3 * * :) *7/8

Like my gas tankless the coils are known to last 30 years, its just
finned copper pipe, there is no reason for them not to last as long as
home copper piping.

Water heater tank life
 

On Mon 15 Sep 2008 06:30:56a, ransley told us...

On Sep 15, 8:11*am, Blattus Slafaly
wrote:
Tony Hwang wrote:
Hi,
Under same condition, only comparing tank life, which one would last
longer, natural gas one or electric one?

I have tankless point of use water heaters. I am *wondering how long
they last.

--
Blattus Slafaly *? 3 * * :) *7/8

Like my gas tankless the coils are known to last 30 years, its just
finned copper pipe, there is no reason for them not to last as long as
home copper piping.


But what about the burner? The products from gas combustion are slightly
corrosive and self-destructive over time, yet I'm sure they do last quite a
while.

I would think a properly designed electric unit might outlast the gas unit.

--
Wayne Boatwright

*******************************************
Date: Monday, 09(IX)/15(XV)/08(MMVIII)
*******************************************
Countdown till Veteran's Day
8wks 17hrs 27mins
*******************************************
Cats must drool in their sleeping
human's ear.
*******************************************

Water heater tank life
 

On Sep 14, 11:23�pm, ransley wrote:
On Sep 14, 9:50�pm, " wrote:

On Sep 14, 10:23 pm, Tony Hwang wrote:

Hi,
Under same condition, only comparing tank life, which one would last
longer, natural gas one or electric one?

electrics tend to last longer.

the downside is much lower performance for electric and higher
operating cost

If cost per btu of both fuels is the same, or nearly, this is not
true. Electric is near 99% efficent, your average gas tank sold is
near 50-65% efficent, with the high end on condensing Ng around 80-85%
total efficency, known and rated as EF. Recovery or performance is
what you buy and need. Gas also loose efficency every year due to
scale buildup that does not affect electric units. And how many ever
have their burner checked to be sure its burning right. A premium
could be paid for electricty and an electric could still be cheaper to
run. Every areas fuel and electric costs are different so run your own
numbers.

obviously you have never replaced a scale covered electric heater
element

Water heater tank life
 

On Sep 15, 5:01*pm, " wrote:
On Sep 14, 11:23 pm, ransley wrote:





On Sep 14, 9:50 pm, " wrote:

On Sep 14, 10:23 pm, Tony Hwang wrote:

Hi,
Under same condition, only comparing tank life, which one would last
longer, natural gas one or electric one?

electrics tend to last longer.

the downside is much lower performance for electric and higher
operating cost

If cost per btu of both fuels is the same, or nearly, this is not
true. Electric is near 99% efficent, your average gas tank sold is
near 50-65% efficent, with the high end on condensing Ng around 80-85%
total efficency, known and rated as EF. Recovery or performance is
what you buy and need. Gas also loose efficency every year due to
scale buildup that does not affect electric units. And how many ever
have their burner checked to be sure its burning right. A premium
could be paid for electricty and an electric could still be cheaper to
run. Every areas fuel and electric costs are different so run your own
numbers.

obviously you have never replaced a scale covered electric heater
element- Hide quoted text -

- Show quoted text -

What is the point of your statement, I guess you dont realise it is
still transfering heat and has nothing in similarity with scale at the
bottom of the tank. The electric element is submerged in water, In Ng
the heat is outside the tank transfering through metal and scale, the
less that transfers the more of your money goes up the chimney. Scale
in the tank bottom impeedes heat transfer. Why not google scale -
reduced efficency and learn why Ng tanks loose efficency every year. I
pulled out a 15 yr old Ng tank that had 12" of hard scale in it, my
new water heater cut my bill alot.

Water heater tank life
 

wrote in message
...
On Sep 14, 11:23?pm, ransley wrote:
On Sep 14, 9:50?pm, " wrote:

On Sep 14, 10:23 pm, Tony Hwang wrote:

Hi,
Under same condition, only comparing tank life, which one would last
longer, natural gas one or electric one?

electrics tend to last longer.

the downside is much lower performance for electric and higher
operating cost

If cost per btu of both fuels is the same, or nearly, this is not
true. Electric is near 99% efficent, your average gas tank sold is
near 50-65% efficent, with the high end on condensing Ng around 80-85%
total efficency, known and rated as EF. Recovery or performance is
what you buy and need. Gas also loose efficency every year due to
scale buildup that does not affect electric units. And how many ever
have their burner checked to be sure its burning right. A premium
could be paid for electricty and an electric could still be cheaper to
run. Every areas fuel and electric costs are different so run your own
numbers.

obviously you have never replaced a scale covered electric heater
element

Scale buildup effects gas heaters differently then it does electric. Scale
slows down the heat transfer into the water. The hot gas goes by and if it
doesn't transfer right then and there into the water, the hot gas is
exhausted and the heat energy is vented into the atmosphere. A little bit of
scale can make a big difference, and efficiency goes out the window.

With electric heaters, scale buildup on the element slows down the heat
transfer from the element into the water. The element gets hotter which
increases it's resistance, and less current flows. However, almost all of
the heat still makes it into the water - where else is it going to go? Even
with old scale coated elements, most of the heat goes into the water and
efficiency remains very high. You don't waste electricity, you don't loose
efficiency, you just don't get your water heated as fast.

Water heater tank life
 

I have tankless point of use water heaters. I am �wondering how long
they last.

--
Blattus Slafaly �? 3 � � :) �7/8

Like my gas tankless the coils are known to last 30 years, its just
finned copper pipe, there is no reason for them not to last as long as
home copper piping.

modern tankless with no pilot light, have complex flame sensors
igniters, and monitors.

once a part fails, if its no longer available you are stuck, plus the
heat exchangers can clog from sediment.

do not assume a tankless is forever, after all how many newer products
really last?

Water heater tank life
 

On Sep 15, 10:39*pm, " wrote:
I have tankless point of use water heaters. I am wondering how long
they last.

--
Blattus Slafaly ? 3 :) 7/8

Like my gas tankless the coils are known to last 30 years, its just
finned copper pipe, there is no reason for them not to last as long as
home copper piping.

modern tankless with no pilot light, have complex flame sensors
igniters, and monitors.

once a part fails, if its no longer available you are stuck, plus the
heat exchangers can clog from sediment.

do not assume a tankless is forever, after all how many newer products
really last?


Modern condensing tanks have more complex parts, so does much other
heating and cooling equipment, my AO smith has 2 fans, 3 vacume
valves, and large circute board, am I worried I wont be able to repair
my 2000$ water heater tank, no. These companies will maintain
replacement parts just as your furnace, Boiler or AC unit. Hallerb you
always do whatever you can to put down Tankless, since you dont have
one, go buy one and save up to 30 % in gas off your new unefficent
"efficent" unit.

Water heater tank life
 

Water heater tank life
 

On Sun, 14 Sep 2008 20:23:30 -0600, Tony Hwang
wrote:

Hi,
Under same condition, only comparing tank life, which one would last
longer, natural gas one or electric one?


Most likely the electric tank, but it will use 2X the operating costs.

Water heater tank life
 

On Sep 15, 6:01*pm, " wrote:
On Sep 14, 11:23 pm, ransley wrote:


...

obviously you have never replaced a scale covered electric heater
element- Hide quoted text -

- Show quoted text -


The scale on an electric heater does not reduce efficiency. 100 BTU
in water gets 100 BTU In a gas you put 100 BTU (after taking all
factors other than scale into account) in you will get less as the
scale builds up.

That said, in almost all areas the cost of heating water is cheaper
with gas than electric even after accounting for scale.

Water heater tank life
 

wrote:

On Sep 15, 6:01*pm, " wrote:
On Sep 14, 11:23 pm, ransley wrote:


...

obviously you have never replaced a scale covered electric heater
element- Hide quoted text -

- Show quoted text -


The scale on an electric heater does not reduce efficiency. 100 BTU
in water gets 100 BTU
-snip-

But. . . A scale covered electrode will transfer those BTUs to the
water slower than a clean one. [can one of you ashrae engineers check
the emmisivity index of copper vs limestone] To compensate for this
slower transfer the homeowner will raise the temp of the tank-
increasing losses- and making the electric less efficient.

On tank life- get the one with the longest warrantee. Pray. Get lucky.
[my cheap LP heater just croaked this week. It was approaching 20
yrs old.]

Jim

Water heater tank life
 

On Sep 16, 4:05*pm, Jim Elbrecht wrote:
wrote:
On Sep 15, 6:01*pm, " wrote:
On Sep 14, 11:23 pm, ransley wrote:

...

obviously you have never replaced a scale covered electric heater
element- Hide quoted text -

- Show quoted text -

*The scale on an electric heater does not reduce efficiency. *100 BTU
in water gets 100 BTU *

-snip-

But. . . *A scale covered electrode will transfer those BTUs to the
water slower than a clean one. *[can one of you ashrae engineers check
the emmisivity index of copper vs limestone] *To compensate for this
slower transfer the homeowner will raise the temp of the tank-
increasing losses- and making the electric less efficient.


Nonsense. If you have a 4500 Watt element submerged in water, where
do you think the heat is going while it's waiting to get to the
water? If the heat isn't going directly to the water, it would have
to be stored somewhere else. And where would that be? Sure, a
scale covered element will run slightly hotter, but it's not going to
be at all noticeable to the user in terms of how hot the water
gets. If it's severly covered or totally buried, it will eventually
burn out.



On tank life- get the one with the longest warrantee. Pray. Get lucky.
[my cheap LP heater just croaked this week. * *It was approaching 20
yrs old.]

Jim