FFH1614BNW I have a heater that i purchased about 5 years ago  and never used, it is for 240 volts and my service to the box is 120 volts, will the heater still work ok with only 120 service?

Bring in the proper voltage available, to designated wires and then "Make Sure" you use the correct plug 120 or 240 !!!!
This is an internal plug at the heater. A 240 plug is in place at time of purchase, if you only bring in 120 volts, then remove the plug and plug in the provided 120 plug.

don't connect without 240v to 110v converter, that available in Indian market (240v-110v,200w)

You need 240 breaker:
Notice that your 240V breaker is twice as wide as regular 120V breaker.
Notice that both switches are tied together on 240V breaker, making this a double-pole breaker.
For more information about breakers and 120-240V circuits:
http://waterheatertimer.org/See-inside-main-breaker-box.html
http://waterheatertimer.org/B220C.html

An oven uses both 120 & 220 -- actually it would be 120 volts and 240 volts or nominally, 110 volt and 220 volt.

The 120 is used for the lights. The 240 is used for the heating elements.

A 240 volt breaker (nominally 220 volt) -- supplies both 120 and 240 volts depending on how the supply is connected to the appliance.

There will be a 240 volt (nominally 220 volt) breaker in the main panel for the oven. This is two 120 volt breakers side-by-side with their toggle switches connected together with a strap across the top of the toggles.

Charlie

no this timer is rated for 240 volts so therfore the clock motor is 240 volts. You will need to purchase a 120 volt clock Good luck!

the baseboard heaters out put goes down a lot more than you would think when used on 120 volts ... thats because not only is the voltage half of what it should be, the current is also half .. so the total power (the product of voltage and current) is one fourth of what it would be if operated on 240 volts .. you are operating at only 186 watts instead of the 750 watts you should have .. so you would have to have 4 times as many heaters for the same heat output .. you likely have the 240 volts available (most houses do) .. there are two phases .. each 120 volts .. when both phases are used together then you get the 240 volts total .. another option is you can use heaters designed for 120 volts .. the current would increase to a little more than 6 amps per heater .. some heaters have a jumper you can move for 120 volt service or 240 volt service... you can use those with either voltage ..

red wire is other leg for 240.use whit ,black and green

Your machine requires 208-240 volts to operate with each leg being about 120 volts. Move refrigerators are 120 volts so even though you have 20 amps you probably only have 120 volts.

You can go to the Bunn website (bunnomatic.com) click on Commercial then on Publications then Illustrated Parts and Service manuals and download the manual for your machine that shows how the wiring hooks up in the machine and the type of cord the machine requires to handle the voltage.

The plug you need must match the receptacle in the wall and there are numerous 220volt plugs and receptacles on the market. Don't get a dryer plug instead try for a twist lock as they are more reliable.

test

if the heater is 120 volt or 240 volt its really pretty easy. at either end is a cover. remove the cover and you'll see a wirenut or maybe just two wires. one side has an integral thermostat. connect your supply to the two wires on the thermostat. connect the other end in your breaker box with the appropriate sized circuit breaker. wire size feeding it will depend on its current draw. how many watts is the heater? 1500 watts will draw 6.25 amps at 240 volts so you can use 14 ga wire. 2000 watts will draw 8.3 at 240 volts - so 14 ga is still ok. 2500 watts at 240 draws 10.41 amps. 3000 watts draws 12.5 amps at this stage I'd use 12 gauge on a 20 amp breaker.