[jr49]

Need to determine if my 200 amp panel will handle two 60 amp circuits for a tankless water heater. I have an all electric home, my 220 circuits are AC, DRYER, HEAT PUMP, RANGE, WEATER HEATER. I will remove 30 amp
water heater circuit, put in two 60 amp circuits for the tankless. My concern is in the winter with heat pump going and I use hot water. Will those three 60 amp circuits be too much load on my 200 amp panel.:smile:

 

[Jim Port]

You will need to do a demand load calculation.

 

[jr49]

jr49

thank very much

 

[TimPa]

Need to determine if my 200 amp panel will handle two 60 amp circuits for a tankless water heater. I have an all electric home, my 220 circuits are AC, DRYER, HEAT PUMP, RANGE, WEATER HEATER. I will remove 30 amp
water heater circuit, put in two 60 amp circuits for the tankless. My concern is in the winter with heat pump going and I use hot water. Will those three 60 amp circuits be too much load on my 200 amp panel.:smile:

what model of tankless is this? does the new tankless water heater require two 60 amp single pole circuits? one 60 amp double pole circuit? or two 60 amp double pole circuits? not familiar with them, but two 60 amp double poles is a huge amount of power to heat water (4 times what you had).

typically, a 200a panel should not have a problem supplying power to a heat pump and a water heater at the same time.

 

[Oso954]

2 pole breakers.
He is looking at a whole house tankless in the 27kw range. Two 60amp 240V breakers (or three 40amp 240v) is typical for this size.

Units in the 36kw range use four 40amp 240v breakers.

Running the tankless water heater and a heat pump is not always a concern. However, running the tankless and the heat pump in cold weather with the heat pump utilizing its electric backup heat is a major concern.

He should do a load calc before attempting to add the tankless.

 

[jr49]

It is a tempra 24 plus 24kw @ 240v, use 2 50 amp max load. I will drop 1 30amp and use two 60 amp two pole circuits

 

[Jim Port]

Have you done a demand load calculation to see if the service can support the additional load? Are you prepared to add a couple of thousand dollars to upgrade the service if it is not large enough?

 

[Arrow3030]

Sometimes the most accurate and easiest load calc can be done using historical data. Do you have old electric bills from high demand season?

 

[mpoulton]

Your water heater uses over half of the total power available to your house. You'll need to do a complete load calculation on the rest of the house to determine whether you have enough capacity. From the information provided, it could go either way. The details of your HVAC system may be the deciding factor. If you have a bunk of auxiliary strip heat in the furnace, it's a no-go for sure.

 

[Speedy Petey]

Need to determine if my 200 amp panel will handle two 60 amp circuits for a tankless water heater. I have an all electric home, my 220 circuits are AC, DRYER, HEAT PUMP, RANGE, WEATER HEATER. I will remove 30 amp
water heater circuit, put in two 60 amp circuits for the tankless. My concern is in the winter with heat pump going and I use hot water. Will those three 60 amp circuits be too much load on my 200 amp panel.:smile:

I can tell you from experience, a whole-house electric tankless unit will almost definitely NOT work in an average home that is all electric with only a 200A service.

Those electricity HOGS are played up as the greatest thing going....until you realize you may have to drop another $3000-$4000 on a nice 400A upgrade.

Stick with a good quality, large, well insulated, tank type unit. You'll be just as happy in the long run and a few grand richer.

 

[jr49]

my power usage jan2015-1321, feb2015-1357,mar2015-895,dec2016-994,jan2016-1324, april2015 to nov2015 under 961, with july 2015 1084 all of these are kwh does this give an idea. I am looking advice

 

[jr49]

thanks just trying to look at all options. my water heater is in my attic. I was trying to get it down stairs and eliminate water problems and sve money

 

[jr49]

thanks to everyone for all the post, since I am a diy I'll kick an idea around in my head till I hit a brick wall. sometimes I don't know when to quit.. thanks!!!

 

[mpoulton]

Gas tankless heaters can be great. I just put one in a couple months ago and I love it. If you have gas, I'd definitely recommend it. However, mine is a 160,000 BTU/hr heater, which is 47kW. That would require almost 200A all by itself if it were electric. It's just too hard to get enough heat from an electric tankless heater. Even the big ones don't compare to gas.

 

[jr49]

Decision on tankless heater

After much thought I am backing away from tankless. My main concern is to get water down from attic. Thanks for the opinions. Now I will plan and install a new unit in my mind first, then do the work. :smile: