Elliott was Northampton’s two-try match-winner as they claimed a 25-23 victory against Bath at Franklin’s Gardens last weekend.
The victory kept them on track for a Premiership play-off place and maintained the momentum ahead of this weekend’s home game against London Irish.
And Waller admitted his delight at seeing pal Elliott, who also grabbed the man of the match prize, impress.
“He’s my housemate, so there’s a nice, big bottle of red wine sitting in the kitchen, which is quite nice to go with mine from the Gloucester game a few weeks ago,” said the 22-year-old loosehead.
“It’s good to see him doing well and obviously he’s a local lad coming from Bedford. He’s just kept his spot now he’s got over his injury problem and he’s going up and up and up.
“Who knows where he’s going to be in the summer, whether he gets a call-up or he gets the summer off, because we’d quite like to go on holiday...
“He’s doing fantastically well and for him to be so young and still performing week in, week out and getting man of the match performances is good for us and good for the club.”
Elliott got Waller out of jail after the forward threw a pass which was intercepted by Bath centre Semesa Rokoduguni, who scored to put his side 23-20 up.
But Elliott’s late try ensured Saints claimed the spoils and Waller says the Northampton players never doubted that they would win the game.
“Obviously you never want to do that,” he said of the pass that was intercepted.
“It was an eight on one overlap and I just managed to pass it to the only Bath player in the way.
“But I was speaking to Jamie about it and even when they scored there was enough confidence with the boys that we were going to win.
“We had time to bring it back and the confidence was something that we may have been lacking in previous games.
“We kept calm, did our job and Jamie scored in the corner.”