How to Properly Inspect a Water Heater

Which as we  just talked about with a tankless water  heater we could have five to six times  the amount of BTUs being consumed if all  of the if all of the fixtures in the  house are open for example if someone’s  taking multiple showers at the same time  the unit could be burning considerably  more BTUs so gas piping is really the  second issue and we can run into that as  an issue on both outdoor and indoor  units yes um about terminology what’s  the difference between a tankless water  heater and a tankless boiler for a long  boiler that’s a really good question.

I  mean yes tankless boiler is really  designed to be used for hydraulics okay  what I mean by that is a tankless boiler  usually has a heat exchanger that’s  pretty resilient and it’s usually  designed to be operated at 180 to 210  degrees which is which would be a higher  temperature than just domestic hot water  hydronic systems typically and  especially in the older homes are  designed to to run at higher water  temperatures some of the older homes  that we go into that have cast-iron  radiators you know the big old they were  like you saw in our schools we used to  sit on to keep warm in the wintertime  those typically need that 180 to 200  degrees of temperature to really have  any recovery and really heat those old  drafty houses right so though we have  done it we have hooked up tankless water  heaters to those systems you’ve got to  be careful about and you’ve got to make  sure that you do have enough radiation  in that house to be able to heat it with  the lower water temperatures at which  these are designed to run and by  hydronic just so we’re sure you mean  space heating rather than domestic  domestic hot water versus hydronic.

Which  is space heating that’s particularly  either baseboard hot water or or  in-floor radiant heat radiators or  baseboards or convector ‘s anytime that  water is being used as a source of space  heat that would be hydraulics is there  anything more that we can talk about as  far as a the the outside version of the  Renee we’re looking at I don’t think so  I think probably the best thing to do  now would be to open this thing up and  take a look inside now on the interior  parts of this unit  other than the venting that we talked  about the vent system there really is  not a lot of difference between the  indoor and outdoor units because we are  taking air in and we’re pushing it out  we basically have two different places  where that’s happening intake and  exhaust and and both of them are  happening here just like this where we  have exhaust and intake okay so it’s a  similar situation but you’re just using  it with an outdoor sealed up unit can  you sort of take take us through this  starting with where the fuel goes in and  and how it goes from there okay yeah gas  valve is this assembly right here and of  course here’s your gas line coming in  this is the incoming water and this is  the output what happens this gas valve  is always idle no pilot no nothing until  water is introduced into the system or  until there is flow so the gas valve is  basically integrated with everything  else this little little item right here  is called a flow Raider or flow servo as  soon as that flow servo detects water  going across it it spins a little wheel.

Most tankless water heaters work that  way not all of them some of the older  boss units actually you or Takagi units  use a little float instead so as the  water comes in it’s more of a mechanical  system this is a completely computerized  system so as you can see this is a  computer board on dip switches behind  here is the main board so this is a very  sophisticated appliance that sends a  signal as soon as water is introduced  the the signal is sent to the  and that signal is sent out to the gas  valve now the thing that sets you talked  about wall-hung boilers and and tankless  boilers one of the things that sets a  tankless domestic water heater like this  Rinnai apart from a lot of the tankless  boilers and other and water tanks and  things like that is this is what’s  called a fully modulating burner system  this gas valve and this burner again are  driven by the board which gets a signal  from the flow rate err that’s the simple  flow of things as soon as the flow rate  er gets a signal sends that signal to  the board the board sends a signal to  the gas valve there are 300 burners in  here Wow what happens is this gas valve  will modulate up and down to give us the  output temperature coming out here  coming out this pipe right here the  output temperature that we want within  two degrees in order to maintain that  temperature to maintain that temperature  we will always get an output temperature  that’s within two degrees which is being  measured by thermistors.

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