Reviving this thread again, as we have the same issue. We want a glass wall with sliding doors to separate between indoors and our winter garden. The glass doesn't need to be insulated because the winter garden is heated and never gets colder than 5 degrees, but it needs to be sealed around to prevent drafts since it is considerably colder than normal indoor temperature during winter.
When I've been looking, I've only found well-insulated glass panels with proper locks, meant for placement between indoor and outdoor or the older type with aluminum profiles, meant for simpler and non-insulated conservatories.
We neither need nor can afford the former, and the latter feels too "summer cottage" to install. Additionally, I don't like that they always have a "mullion" in the middle.
The "door opening" is approximately 220x210 cm.
Grateful for any tips!