Here is an update to information. I now have a copy of his marriage certificate concerning his marriage to Henrietta Roberts. They were married on 8 July 1900 in Birkenhead, England. He was a Tailor at the time and listed his father as Edward Erber, deceased, General Merchant. He listed his age as 21, same as Henrietta's.
I had also found an 1881 English Census for London area showing a John Erber from Vienna, Austria age 25 at that time and he was a Waiter. Not sure if this is him or not yet.
I also found an online index in the English National Archives showing that "Henrich Johann Christoph Gustav Erber" became a British citizen on 20 February 1926 and was a resident in St. Annes-on-the-Sea, having come from Switzerland. Unfortunately, these records are sealed for 100 years! He was at least 50, if not 60 years old when he became a citizen.
Is there anyone else researching this family?