The House of Prayer

"... and will fill them with joy in my house of prayer"(Isaiah 56:7a)
God's house is called The House of Prayer and that is what Jesus was saying in Mark 19:46 He said to them,"The Scriptures declare,'My Temple will be a house of prayer', but you have turned it into a den of thieves" and this verse can be found word for word in Jeremiah 7:11.
Does this mean Heaven is all about prayer or is God's house, the Church (I mean the body of Christ); what did Jesus mean? Is that why the Bible says in 1 Thessalonians 5:17 that we should never stop praying(NLT) or pray all the the time(MSG) or pray without ceasing(KJV), because if we pray all the time, we become a house of prayer.
Jesus demonstrated his grief in the physical temple in Jerusalem but we know that from Ephesians 2:19-21 that the Apostles and Prophets represent the foundation, Christ Jesus is the Cornerstone, while we are the bricks and stones; all carefully joined together, we become a holy temple for the Lord Almighty, so this indeed means that God wants us to be a mobile house of prayer, indeed praying without ceasing in and out.