Resistors Part #

https://www.ohmite.com/catalog/power-resistors

They do not list a 1000 watt resistors so it would require series and paralleling a bunch to get the wattage up to 1K.

Then you have the issue of dissipating 1000 watts of heat...not a very professional way to do it...get a heater instead.

Many heaters significantly vary their resistance as they heat up. A proper load bank, like these from Ohmite, will keep a very consistent resistance over a temperature range. Without knowing how the OP intends to use this, resistance changes may or may not be a problem. A 1kW halogen lamp could also fit the bill.

Now where will this heat go?

Look here instead:

https://www.ohmite.com/high-power/

Two of these on a water-cooled plate and you can dump the heat down the sink if you don't want to warm the room.

this is a good choice, but expensive

maximum working voltage is 5000VDC. But the request is 120Vac. SO This may not work at all.

In most cases, it is O.K. to use a part with a higher voltage rating than the operating voltage. Not only is it O.K., most require it.

For around $30 he can get the heater I linked to.I have used heaters many times for load testing with no problems.They work well,and last a long time.

I load tested a 25 kw ups and had to put the heaters outside of the building because of the heat load on their A/C units.

Please list the suppliers that have been approached so far, and in which countries they operate. This will enable the forum to produce a quicker response.

The duty sounds like a single bar electric fire, available on a well-known internet auction site, for example.

Why not use a 1000 watt heater?Already designed for that amount of wattage.

A lot cheaper and simpler than a bunch of resistors.

Here is a link to what looks like might suit your needs:https://www.amazon.com/Dheera-Portable-Electric-Thermostat-Protection/dp/B08JGHW242/ref=sr_1_2_sspa?dchild=1&keywords=1000+watt+heater&qid=1606078615&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzNE1ENlZJRFhRRklDJmVuY3J5cHRlZElkPUEwMzIzMjk5M1NXVEtEOEFPTjlHNSZlbmNyeXB0ZWRBZElkPUEwNDgyMzA3MjYwTVNITU5GOTJZNSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

You will not get 1000 watts with 120v and 18 to 20 ohm resistors.

You will need 8.3 ohms to get 1000 watts, and 6.67 ohms for 800 watts.

Er, um, try that calculation again, please?

No matter how hard I try,Jose Cuervo can not do simple math.And he's not too good at passwords or spelling either.It took him 5 tries to log in.I should have known better.And this morning he is still lingering in the shadows,and I will have to have some hair of the dog before I go any fuuuurther.

I hope to be bak lader.I de ose!

I wonder if he needs the ohms and volts and wanted some excess wattage capacity?

I have "over specified" the wattage rating on designs to keep the temp rise down.

(I always thought the lost heat could be used by using a hot water tank heater, but never had any takers - they would add air conditioning to the room first.)

Recalculation,sans Jose Cuervo:

I feel much better now.

14.4ohms for 1000 watts,and 18 ohms for 800 watt.

https://www.ohmite.com/metallic-load-bank-resistors/#:~:text=Metallic%20load%20bank%20resistors%20are,for%20generators%20and%20large%20motors.

They have these for DC...

GS-BR-1K0W020

Braking resistor, 1000W, 20 ohm, encapsulated. For use with multiple AC drives.

https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/vfd_accessories/braking_units_-a-_resistors/gs-br-1k0w020?gclid=CjwKCAiAtej9BRAvEiwA0UAWXsFiD4DSpOzHD40-ADVmrn06xsMwyWjdcxeREv0oNgP1BM32YEDpPBoCFDIQAvD_BwE

I imagine that this is a replacement part in an already assembled "load bank."

Why not contact the OEM, research the schematic, or look at the print?

Why not use a 1Kw jug element as the load resistor and while it is heating the water make yourself a cuppa and think how easy it was to get a useful load with side benefits.

Please give this forum the respect of posting your decision on this matter.

If its a simple load bank rather the a component replacement a previous posters suggestion of a 1kW 110V convector heater takes some beating. A useful load bank in a nice container.

The tungsten halogen lamp is a bad idea. A tungsten lamp presents a cold filament to the supply and on initial start up takes around 15 to 20 times the current. Different matter once the filament has warmed up. I believe the heater is a little more gentle.