Recent content by dimprov

Just how accurate are tempering valves? Is it +/- 1 degree, +/- 5 degrees, +/- 10 degrees, or +/- 20 degrees? I read that they are somewhat crude and can have large +/- temp variation, but I couldn't find any info beyond that. It would force you to set the water temp low enough so that the...

The Navien rep told me, and this is a direct quote: "The decibel rating of our units range from 25-30. It is much quieter than our competition. You will not hear our burner or fan unless you have your ear up to the unit." If true, then they've won my heart and I'm buying Navien as soon as...

I just spoke to Navien. They said not only do they not ding your warranty if you recirculate, but their unit comes with a recirculation pump already built in. The built-in buffer tank is 1/2 gallon, which they said is enough to prevent cold water sandwich. I asked for a copy of the...

I'll assume natural gas, because that's my fuel source. Is it just my false impression or is the dividing line between tankless and boilers is starting to fuzz over? In its favor, a boiler clearly assumes you're going to recirculate the water, and so it doesn't ding your warranty if you do...

It shouldn't change your decision, but one possible gotcha I just realized: somewhere down the line one of your units goes bad and needs to be replaced. Not a problem now, but in the future maybe that model is no longer made. :eek: What then? Will the tandem/manifold controller work with a...

Non-potable. Closed-loop hydronic system for heating. Exterior, wall-mounted unit. Any issues with performance, maintenance, warranties, etc.? If it matters, I'm gravitating toward a Rinnai. I'm dealing with meager data and unscientific anecdotes, but it points toward Rinnai as being...

Nicholas, With those facts and choices, it seems like a no brainer, provided you have the space. Consider: 1. You would need to maintain the GU32 as well. 2. Odds are against both Rinnai's failing simultaneously. So, if one goes bad, you still have one to limp along on until you can...

Nick, You may find this comparison chart helpful: http://www.focusonenergy.com/data/common/dmsFiles/R_RR_REFR_PreqlNatGasWH90Per0707v2.pdf It lists condensing water heaters from various manufacturers that have thermal efficiency of 90% or greater. The Rheem HE45-199 looks to be of...

Thanks for the correction, BimmerRacer. I thought it was your initials.

Thanks for running the test, YMMV. It proves that loudness varies with demand, and therefore a single number of 49 db(a) can't be right. I think I'll assume 49 db(a) is the low end. If the newer Rinnai units manifold the way the older Rinnai units did, then by running 3 Rinnai tankless...

One thing different about the Eternal is that it's minimum BTU consumption is 47,500. That's more than 2x a Rinnai or Bosch. I happen to have the actual BTU figures documented in another thread: https://terrylove.com/forums/showthread.php?t=26964 David

BimmerRacer, Does its loudness vary depending upon demand (i.e. maximal versus minimal water heating, such as all taps open versus a single faucet)? David

For instance, Eternal gives the "maximum noise" for it's different models, although it's ambiguous as to whether Eternal's db refers to db(a) or some other reference. Ideally, I'd like to see the SPL's at different frequencies so I could pick the most appropriate soundproofing materials, but...

I'm considering the purchase of multiple Rinnai tankless hot water heaters for a remodelling project where maintaining quiet is one of the design objectives. Rinnai claims its tankless units are quiet, and claims a noise level of 49 db(a) across its range of tankless models--see attached...

I guess you mean the transition at the bottom? I toook some closer photos. I could post if it might shed any light. What would be the motivation for using this type of connection? The house is vintage 2001 built by a major, publicly traded builder, not some crackerjack outfit. David