A grade are high quality wood pellets for domestic use. If You think about difference about DIN plus and A grade You will not see big difference. Mostly what You will see is that You will have ~10 % less costs compared to DIN plus. Even the heat theoritically is less than in DIN plus, but we have seen that many sellers sell DIN plus with the heat the same as for A grade. So, be sure You get this material, because it is really good to heat Your home!