Wǒmen jiā de kǎomiànbāojī huài le, děi huàn yī ge xīn de.
Our toaster is broken; we need to get a new one.
Tips
usage
Don't confuse 烤面包机 (slot toaster) with 面包机 (bread maker, 'breadmaker' that bakes a whole loaf from flour). The 烤 here means 'to toast/bake' the already-made bread.