20 kw furnace breaker size May 16, 2025 · Choosing the correct circuit breaker size for your air conditioning (AC) unit is vital for safety, performance, and compliance with electrical codes. Nov 28, 2011 · Can you provide a model number of the furnace? What I suspect is this, you have a 25 KW furnace that has had a 5 KW element disconnected and one breaker has been changed to run the unit as a two circuit 20 KW furnace, but knowing the model number would probably tell the story. Apr 23, 2025 · Heat strips come in various sizes and capacities, and they require proper electrical setup—including correct breaker sizing—for safe and effective operation. How many amps does a 20kw furnace draw? I looked and all of the strips are hooked up (don't know about working though) has me really confused my good friend has a doublewide and they have two 60 amps on the box. 5 - 2. The manual says it needs a single circuit 80 amp breaker to split to 2 breakers in the unit with a jumper kit. Discover the amp and wire size for a 208 volt 3 phase, 15 kW heat strip for an air handler. The bigger your home, the more kilowatts you need. E3EB-xxx-H Series Downflow, Upflow Electric Furnaces The E3 Series furnace is designed for all sizes of manufactured and modular homes. Usually you should buy the heat strips with built-in breaker. Check out this article to know what furnace breaker size is needed for your installation. 0 tons Heat Pump - Use a 20 Kw Coldest winter climates (Average low winter temperatures of -10 degrees and up) Dual Fuel Hybrid Heat pumps with a gas furnace are recommended for these climates for the best possible heating. installations. We offer fast, free shipping with every purchase. Phase (single vs three-phase) should match your home’s power Feb 18, 2019 · Are you increasing the size of all of your duct work to use a 20 KW strip heater? Why are you up sizing the heat kit, did you add on to the house? For 20 KW, it would be 2-6/2 wire runs, and 2 60amp double pole breakers. ” Electric furnaces and heat strips draw the heaviest electrical load of any HVAC product. Enter the current in amperes (A). This article explains how to determine the correct circuit breaker amperage for residential furnaces, common breaker sizes, calculation steps, wiring considerations, and troubleshooting tips to help homeowners and electricians make informed decisions. If I remember right, a couple of the ones I wired had a 60 amp 2 pole and 2 - 30 amp 2 pole breakers. Amperage draw determines breaker and wire size. The MCA is typically calculated as 125% of the rated amps, while the MOCP is often calculated as 225% of the rated amps. Get expert answers on wire gauge, breaker size, and disconnect options today! The furnace air handler has 2 - 60amp dp breakers which are fed from a 125a dp breaker, which was used for the old furnace. 5A). An electric furnace uses 60/80 amps, a gas furnace uses 15/20 amps and an oil furnace uses 30 amps. (Side with 1/4" terminals to the right). You will need, on average, 1. Occasionally, I’ll see a 20-amp circuit breaker on a 4500-watt water heater. For example, a 20kw furnace at 240 is 84 amps. You can’t just eyeball it. A 15kW electric furnace typically requires a 60-amp double-pole breaker, based on a 240V supply. To size a circuit breaker for a heater, you should select a breaker that is rated at 125% of the heater’s rated amperage , which means choosing a breaker that is 25% larger than the calculated amperage draw of the heater. For a 20kW furnace, use appropriately sized wire based on breaker amperage—typically 30-40 amps. And they pull a lot of amps. Sep 28, 2025 · A 20 kW furnace on 240V draws ~83 A. I seem to recall that Carrier generally produced single circuit furnaces and Lennox furnaces were generally 2 circuits. May 14, 2010 · I have what is probably a stupid question. May 14, 2024 · Our kW to Cable Size and Amp Chart can help you determine the appropriate cable size for your electrical projects. For 600 amp service, we recommend a wire size of 1,750 kcmil. 5" D x 17" H Limited Warranty Parts: 5 years Product Details The breaker size for a furnace depends on power consumption and output voltage rating. Info tip: At the circuit breaker box, the important issue of preventing damage to the wiring and the system in general is addressed. Jun 12, 2024 · Breaker Size Calculator This calculator helps you determine the appropriate breaker size based on the entered voltage, current, and phase. Multiple branch circuit capability. The amp draw determines the size of a breaker. Most new furnaces will have breaker disconnects in them and that is where the circuits terminate, in the lugs of those breakers. This guide explains how to determine the proper electric furnace breaker size, typical breaker and wire combinations, code considerations, and troubleshooting signs of an undersized or oversized breaker. That’s what I normally see in furnaces this big. Larger units often require 30 or 40 amps. Description Product Summary 20 kW Electric Heater With Breaker 480 VAC Three Phase Aug 21, 2025 · Common Wire Sizes Used for Furnaces The most frequent wire sizes used for residential furnace installations are 14 AWG, 12 AWG, and 10 AWG, chosen according to furnace load and circuit breaker rating: 14 AWG Wire: Rated for 15 amps, suitable for small furnaces with low power requirements. voo txyydtnq dppmk cmqkx wxxmx mzisut brulv xckp igyicp qjzw oqrfrpz kqwkje rib bihd jarwzkxq