There are several posts about Citrumelo, in this HARDY CITRUS topic and others too. Here is one from Hamburg, Germany which might be helpful to your location ?
There are at least several Citrumelos, SWINGLE; SACATON(YUMA); CITRUMELO 1452; DUNSTAN;
Fruiting will depend upon if you have a seedling, or a grafted plant.
In my climate, Swingle fruit are far better than Poncirus, something like a dull grapefruit flavor, with a fair hint of Poncirus flavor. The juice is ok for interests sake, I would say quite acceptable, but not comparable to common Citrus.
Swingle is reported to be a Poncirus X Grapefruit hybrid, commonly used as a rootstock. Not sure if others are all the same cross, or if any are Pummelo hybrids ?