Solar water heater boiler 300 liter offer request - Russia

Hello.
Let me introduce myself: My name is **. ** company.Krasnodar.
We want to order a boilers on 300 litters for solar system, with heating element (1 outline, or 2)
do you have this? Can we use it for a solar system?
If yes, waiting at response from you, and if its possible, send to me the following documents:
the price list, characteristics on appropriate boiler and the agreement.
Thank you