tankless hot water heaters froze - DFW
Ugh. Both of my Rinnai hw heaters froze three days ago. Plumbers thawed one out yesterday and I ran water through it all night, and the damn thing froze again last night anyway.
For both, the external pipes have insulation, but the pipes run down the inside of the wall and that's where the problem seems to lie.
Can anyone tell me how these are normally insulated in cold weather climates? Before my guys come in and start jacking out bricks to insulate them, I'd like to make sure we get it right.
For the record, we had no issues last winter with this, but the weather's been colder for longer than normal. This is an every-ten-years kind of freeze, but I would like to make sure we can withstand it next time.