Definitely keeps a consistent temp. My first batch I didn't account for 40 degree temps + didnt pre MT and did not heat my strike water up enough. It took a while to heat the mash through the HERMS about 10 degrees. But that's my fault. I am also planning on using the HLT as a pre chiller for my plate chiller in the summer time. Ice water in the kettle, cooling water goes through the HERMS before the plate chiller. Haven't done it yet though.