Joined on December 29, 2008
Last Post on December 9, 2013
@ December 9, 2013 6:30 PM in Navien ch 240Of the home have to do with it. The question is, What is the hot water demand and what is the heat loss of the home. You know better HO1..
@ December 6, 2013 1:23 PM in Gas Conversion Help.Tim, agree with you but times are different. It also falls in with the PVC venting debate. Kind of the same thing isn't it?
@ December 6, 2013 10:48 AM in Gas Conversion Help.Is approved for conversion since its offered with a gas power burner and has the testing. Will a gas conversion burner work when properly installed and set up. Sure will and very well. The issue comes down to liability. Not approved so the liability falls onto the contractor.
@ December 6, 2013 7:48 AM in Gas Conversion Help.Here will be their response.....NO!!! Installation Manual speaks for them. Been down this road many times. Also keep in mind that any warranty left on the cast iron will be voided.
@ December 4, 2013 6:40 PM in Navien ch 240Not sure what you mean. My posting was really referring to the secondary side not the boiler/primary side and was at design conditions. Maybe I should have been clearer on that.
I'm surprised with the new unit they haven't incorporated a system side supply sensor to assist in overcoming the water temp drop that happens on the secondary/ system supply when piped with either their manifold kit, two closely spaced tees or a low loss header. In reality it doesn't matter what the boiler supply water temp is, it's the secondary side that needs to deliver to the emitter an x water temp not the boiler.
Homeowner, if you were referring to my post you are mistaken. I'm absolutely correct. Boiler only makes about 5gpm and if I need 12gpm on the system side the 7 has to come from the system side return. There are no Criss Angel's in the boiler room. Notice I didn't say anything about btu/hr and I didn't say you couldn't get more then 50K Btu/hr out into the system side. What I said was at what water temperature and that is critical.
@ November 30, 2013 6:14 PM in Navien ch 240That is the concern, its system supply water temp when your system side flow rate is larger then the boiler flow rate. A btu doesn't care about 180 or 120 degree water its still a btu. Using HD's 120K example on a typical 20 delta (which never happens in reality).
(5 X180) + (7 X 160) = 12x
900 + 1120 = 2,020 / 12 = 168
Will 168 degree water get the job done and are we happy with an 8 degree system side delta? Iron by the way, the boiler is a tee, what goes in must come out no different then your closely spaced tees.. If I get 5 from the boiler, 5 goes back in. The 7 are what's left from the 12 in system side return after 5 went back to the boiler return.
The difference between Navien and everyone else from an operation standpoint is that it does not recapture flue gas condensate, thus not picking up loss latent heat from the flue.
@ November 30, 2013 5:40 PM in Maximizing efficiency of a mod con questionUser a buffer tank as your pri/sec, ie Low loss header. Caleffi has a Thermocon 25 Gallon and that will end your short cycling issues along side with sizing your primary or boiler pump for a larger delta, ie 35 degrees.
Since the boiler has minimal pressure drop and a fixed speed circulator operates on its curve your best option for a boiler pump is a B&G Vario because of its ability to operate at gpm and heads lower then an Alpha, Bumblee Bee. All variable speeds pumps still operate on curves, its just a matter of how many they have and they all have limitations.
Second I'd get rid of the zone pumps. Zoning with fixed speed pumps is no more then a recipe for over pumping. Use Taco Zone Sentry's and pick the best variable speed ecm pump for the job and call it a day.
@ November 20, 2013 12:05 PM in Radiant floor heat not heating properlyWhat are the floor coverings in the bedrooms? Carpet? I see no mixing device in the boiler pics so this system is running on one water temp. Where's the heat loss and design to say one water temp is what you need?
@ November 16, 2013 8:29 PM in ViessmannPaul they are on the list. HDE where did you here any of what your posting?
@ November 1, 2013 6:39 PM in HydroMXThose same things. Have someone asking us if we are interested in it and trying to see if anyone has used it.
@ November 1, 2013 8:03 AM in HydroMXWhat concentration of this juice is water? What about dissimilar metals in a system? Gots a million questions on this sutff. Not getting many replies, really looking for someone who has experience using this potion.
@ October 31, 2013 11:52 AM in HydroMXAnyone have any experience with this product? Thoughts?
@ October 29, 2013 12:51 PM in NG Combi Boiler versus indirect tank and boiler setupNot very professional. Just some advice. What's a heater? I know of a boiler, furnace, tank type water heater, on demand water heater not sure what a heater is..Why would I need one, if I didn't have one?
@ October 29, 2013 7:12 AM in Rumor has itModel 19 is avail right now. Its the 35's that will not be avail until around Thanksgiving. I have the pricing and I'm in NJ so drop me an email. If your a homeowner I can hook you up with a Viessmann Partner contractor, if a contractor, I'll quote ya.
Putting the 19 in my house. My DHW demand is basically one shower at a time. Scrapping the zoning, slapping a Vitotrol 300A in place of the T-Stat, piping it direct and letting it fly. My heat loss is only 36K and I've changed out all my base board to hi cap so can start my curve for a 140 degree water temp at design.
@ October 27, 2013 4:54 PM in Need recommendation for manual reset high limit setting on Ultra boilerJust tired of consumers in general, whom after choosing the cheapest installer come here to complain about their installation and/or contractor, ask for the solution or guidance, when they had the solution the entire time but did't want to pay for it.
@ October 27, 2013 2:28 PM in Need recommendation for manual reset high limit setting on Ultra boilerBoiler is a heating plant, period, end of sentence!!! It is a piece of equipment that produces heat and has no responsibility as to the system side. If the boiler is operating it isn't broken and the mfg end of the chain is done. Since when did the boiler mfg size, design and recommend the radiant heat? It did not. No different then the cheap HDMI cables that come with that nice 60 plus inch flat in the living room, it works right? Does that manual tell you they are the cheap cables and to go out and buy some monsters because the pic will be 10 times better?
Its funny how our industry is scrutinized so deeply by the blind and internet educated DYI consumer. Bet your friends installer was the cheapest guy that bid the job.
@ October 27, 2013 11:31 AM in outdoor reset and thermostat setbackAre you setting back the thermostat or the heating circuit via the boiler. What is the nighttime setback in the boiler control and for what time period. The control can be programmed for a heating schedule just like a thermostat. Sounds like your setting back a room t-stat and not the boiler. If you are how does the boiler know you set back? It doesn't so it doesn't know to shift the curve itself.
Is this a Vitodens 200? Vitola 200?
@ October 27, 2013 11:16 AM in Need recommendation for manual reset high limit setting on Ultra boilerA high limit not all the other items of concern you just posted. A piping diagram in a manual is conceptual. If I installed a low loss header instead of 2 closely spaced tee's and didn't use a Spirovent or Air Scoop would I be wrong? Nope, If my expansion tank and feed are piped on the primary side below the boiler pump am I wrong? Nope.
If I put my secondary pump on the return and my zone valves on the supply am I wrong? Nope. In other words the manual is not a bible to installation, its merely a map that can be adjusted, providing you still maintain proper piping practice.
If I decided I didn't want to use that boiler/primary pump that came with the boiler am I wrong? Nope. My point is a piping diagram is conceptual and can deviated from providing you still maintain proper piping principals. I don't need a high limit for my radiant under all conditions and honestly one is rarely if every used. Why? Proper piping, control and installation.
@ October 26, 2013 10:48 AM in Viessmann & Siggy differ on efficiency at high return temp?That's the setpoint the boiler is using to calculate the curve. You could graph the months of the heating season with daily daytime and nightime temps and come up with your operating percentages. Might not be 100% accurate but will give you a idea of where you'd be running most of the heating season.
@ October 26, 2013 10:42 AM in Need recommendation for manual reset high limit setting on Ultra boilerDon't see where that is an installation error. You stated the contractor missed the need. Nothing is missed. I'm going to assume your friend has the heat loss and radiant design right? Your dealing with a low temp and high temp radiant so they both have mixing valves correct? The boiler has the ability to cap off the highest supply temp correct? The boiler has an adjustable high limit correct? So where's the need?
I'm only stating these because your up here putting the blame on the contractor, ever think there was a reason why? The piping schematics in the manual are CONCEPTUAL!
@ October 22, 2013 12:14 PM in Viessmann & Siggy differ on efficiency at high return temp?Navien does not capture flue gas condensation to reclaim the loss latent heat. While it may condense it still doesn't reclaim lost btu/hr through the venting system. It also does not come ODR unless the installer purchases it separately. Navien, because it has a CAFUE vs an AFUE rating isn't held to the new Sept 2012 standard. That's the story to be told when competing against it. Your correct because he only posted one part of the Viessmann chart h left out the heating curve chart which is attached.
@ October 22, 2013 11:53 AM in Viessmann & Siggy differ on efficiency at high return temp?