Long time reader, first time poster. Been following many of the theatre threads in here pretty regularly, as I am in the beginning stages of converting a portion of our basement into a home theatre / media room.
The beginning stage of this process is going to require me to do something about our utility room. We have a tankless water heater in our utility room, which is direct adjacent to one of the walls of the room we'll be utilizing as the theatre. The tankless unit emits an intermittent high pitched buzzing/humming noise during operation (apparently this is the mixing valve and is deemed part of normal service operation by the manufacturer). We've currently got this thing mounted onto 2x 3/4'' sheets of plywood, attached to a concrete block wall in the utility room.
I would like to build a sound-dampening enclosure around the unit to eliminate this noise as much as possible, and have been doing some research for how to go about this. I have searched through the forum and haven't found any similar threads, so I figured I would ask here in hopes one of the resident sound experts can suggest something.
Before anyone mentions safety, the unit is a self-contained high efficiency condensing water heater, with dedicated intake/exhaust from outside, so there are no safety issues with enclosing it. My initial thoughts are to build a box out of 3/4 MDF, and line the inside of this box with MLV and fiberglass if possible. The only issue I can see with building out of MDF is that it will be a PITA to accommodate the necessary holes/openings for pipes (3/4 cold and hot + 3'' intake and exhaust on top of unit, 3/4 gas in on side of unit)
Has anyone had any experience with building a soundproofing enclosure for something similar (boiler, tankless water heater etc)? If so, what did you use and did you find it effective? I will happily post pictures once I get home tonight, if anyone feels they may help.
Thanks in advance!