Electric hot water heater question...

chocophile · 03-07-2015, 09:56 AM

We have an on-demand hot water heater (natural gas) and I'm not thrilled with it.

There is a delay after the water begins to flow, and it takes a while to heat up the exchanger before the water gets hot. As a result, you have to run the water for a long time before it's hot at the faucet. If you're just washing your hands, it takes too long.

When you shut off the water, the heat exchanger quickly gives up its heat. So when you turn the faucet back on, it's cold again and you have to wait.

You end up wasting a lot of water waiting for it to get hot.

If you are in the shower when someone starts up the dishwasher or washing machine, you get widely varying pressure, so temperature variation.

Finally, I think another thread mentioned that you cannot completely drain an on-demand unit to shut it down in the winter.

I can imagine a unit that addresses these complaints, but I don't think it's on the market yet.

BroadHopper · 03-07-2015, 10:33 AM

Quote:

Originally Posted by chocophile

We have an on-demand hot water heater (natural gas) and I'm not thrilled with it.

There is a delay after the water begins to flow, and it takes a while to heat up the exchanger before the water gets hot. As a result, you have to run the water for a long time before it's hot at the faucet. If you're just washing your hands, it takes too long.

When you shut off the water, the heat exchanger quickly gives up its heat. So when you turn the faucet back on, it's cold again and you have to wait.

You end up wasting a lot of water waiting for it to get hot.

If you are in the shower when someone starts up the dishwasher or washing machine, you get widely varying pressure, so temperature variation.

Finally, I think another thread mentioned that you cannot completely drain an on-demand unit to shut it down in the winter.

I can imagine a unit that addresses these complaints, but I don't think it's on the market yet.

Funny Its the opposite for me. It takes a minute for the hot water to reach the faucet and it is hot! Even when the dishwasher and clothes washer is on I have a great shower. I love my tank less hot water heater. Maybe it is not installed right? I have the System 2000 unit.

Hawley · 03-07-2015, 02:28 PM

System 2000 by Energy Kinetics doesn't make a on demand water heater. They use a plated heat exchanger with a storage tank.

Kamper · 03-08-2015, 09:04 AM

'On demands' do have the delay and waste situation described above but for low-use periods you might want to consider one of the less expensive ones offered at Sportsman's Guide.

I got the cheapest propane version, to use in a camper I have as a guest house. The more expensive ones are about $250 and should be enough for a regular household. If you are handy, you can plumb a spigot line from the hot-water circuit to the outside of your house fairly cheaply and even if you hire a plumber it shouldn't take more than 2-3 man hours.

The whole thing will be much less than the couple thousand that will be wanted for an inside installation. When the propane tank gets chilled it won't provide as much energy to the heater but you still have your boiler to switch on. It's just a question of turning a few valves when you decide which unit to use.

If this suggestion doesn't work out for you, you can still get some of your money back by selling it and you'll have a hot water outlet which will come in handy for cleaning your grill and other gear.

I mounted mine on a post a couple feet away from the trailer wall. I would suggest a similar installation but the larger ones do offer more conventional options. Mine is removed in the off-season but you may choose to leave it in place but winterized.

Good luck!

BroadHopper · 03-08-2015, 12:25 PM

Quote:

Originally Posted by Hawley

System 2000 by Energy Kinetics doesn't make a on demand water heater. They use a plated heat exchanger with a storage tank.

I don't see a storage tank, and I was told it was tank less. Now I am really confused! It is a great system BTW. It works well with a Mitsubishi split system.

BroadHopper · 03-15-2015, 11:44 AM

I didn't realize they make different models. I have the Accel CS which is a wall mounted integrated boiler. It is one of the most efficient boiler in the 2015 Energystar website. Take a look at this http://www.energykinetics.com/accel-...g-boiler.shtml

TheProfessor · 03-20-2015, 11:53 AM

I have an on demand tankless propane water heater.
Does work and has worked for 10 years.
But it does require adjusting. Water pressure and flow rates.
And there is no one who can repair these. Yes, some claim to be able. But in the end the cost of any repair would approximate the cost of an ordinary 30 gallon electric water heater.

Bottom line.
If I had to do all over again. I would purchase an ordinary run of the mill 30 gallon electric water heater. Easier to replace when wears out and less expensive.

03-07-2015, 09:56 AM	#1
chocophile Senior Member Join Date: Apr 2004 Location: 19-Mile Bay Posts: 117 Thanks: 15 Thanked 33 Times in 16 Posts	On-Demand Has Some Drawbacks We have an on-demand hot water heater (natural gas) and I'm not thrilled with it. There is a delay after the water begins to flow, and it takes a while to heat up the exchanger before the water gets hot. As a result, you have to run the water for a long time before it's hot at the faucet. If you're just washing your hands, it takes too long. When you shut off the water, the heat exchanger quickly gives up its heat. So when you turn the faucet back on, it's cold again and you have to wait. You end up wasting a lot of water waiting for it to get hot. If you are in the shower when someone starts up the dishwasher or washing machine, you get widely varying pressure, so temperature variation. Finally, I think another thread mentioned that you cannot completely drain an on-demand unit to shut it down in the winter. I can imagine a unit that addresses these complaints, but I don't think it's on the market yet.

03-07-2015, 02:28 PM	#3
Hawley Junior Member Join Date: Aug 2012 Posts: 15 Thanks: 0 Thanked 2 Times in 2 Posts	On Demand Water Heater System 2000 by Energy Kinetics doesn't make a on demand water heater. They use a plated heat exchanger with a storage tank.

03-15-2015, 11:44 AM	#6
BroadHopper Senior Member Join Date: Oct 2004 Location: Laconia NH Posts: 5,669 Thanks: 3,285 Thanked 1,132 Times in 814 Posts	Energy Kinetics Sytem 2000 I didn't realize they make different models. I have the Accel CS which is a wall mounted integrated boiler. It is one of the most efficient boiler in the 2015 Energystar website. Take a look at this http://www.energykinetics.com/accel-...g-boiler.shtml __________________ Someday may never be an actual day.

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03-08-2015, 09:04 AM	#4
Kamper Senior Member Join Date: Jul 2005 Location: Thornton's Ferry Posts: 1,314 Thanks: 67 Thanked 172 Times in 128 Posts	'On demands' do have the delay and waste situation described above but for low-use periods you might want to consider one of the less expensive ones offered at Sportsman's Guide. I got the cheapest propane version, to use in a camper I have as a guest house. The more expensive ones are about $250 and should be enough for a regular household. If you are handy, you can plumb a spigot line from the hot-water circuit to the outside of your house fairly cheaply and even if you hire a plumber it shouldn't take more than 2-3 man hours. The whole thing will be much less than the couple thousand that will be wanted for an inside installation. When the propane tank gets chilled it won't provide as much energy to the heater but you still have your boiler to switch on. It's just a question of turning a few valves when you decide which unit to use. If this suggestion doesn't work out for you, you can still get some of your money back by selling it and you'll have a hot water outlet which will come in handy for cleaning your grill and other gear. I mounted mine on a post a couple feet away from the trailer wall. I would suggest a similar installation but the larger ones do offer more conventional options. Mine is removed in the off-season but you may choose to leave it in place but winterized. Good luck!

03-20-2015, 11:53 AM	#7
TheProfessor Senior Member Join Date: Nov 2010 Posts: 1,164 Thanks: 17 Thanked 357 Times in 214 Posts	I have an on demand tankless propane water heater. Does work and has worked for 10 years. But it does require adjusting. Water pressure and flow rates. And there is no one who can repair these. Yes, some claim to be able. But in the end the cost of any repair would approximate the cost of an ordinary 30 gallon electric water heater. Bottom line. If I had to do all over again. I would purchase an ordinary run of the mill 30 gallon electric water heater. Easier to replace when wears out and less expensive.