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  1. We are presently doing some analyzing the...

    We are presently doing some analyzing the replacing of the fan coils with forced air units.

    First step is figuring out the heat needs of the upper and main floors. Second step is figuring out...
  2. Thanks for all the replies. I'll comment once...

    Thanks for all the replies. I'll comment once I've given them some thought.
  3. Are you suggesting to get rid of the indirect...

    Are you suggesting to get rid of the indirect tank and replace it with a combination boiler and inline hot water heater ?

    The house has 4 bath tubs or showers. I'm worried that an inline hot...
  4. 3 years ago all I knew about HVAC was that you...

    3 years ago all I knew about HVAC was that you had to replace the batteries in the thermostat. What a nightmare this has been.
  5. Replacing the fan coils with furnaces. My...

    Replacing the fan coils with furnaces.

    My house has a little ducting idiosyncrasy. It uses a "high velocity" system, made by these guys. http://www.hi-velocity.com/

    Three isn't really...
  6. Bingo ! I figured this was the case, but nobody...

    Bingo ! I figured this was the case, but nobody would tell it to me like that. Thank you ! I appreciate your candor.

    Why aren't fan coils more than 85-88% efficient ? Because the water coming...
  7. A little story. Last winter it got bitterly...

    A little story.

    Last winter it got bitterly cold for a week. I happened to be out of town. Of course the boiler quits. My wife calls me and says the house is cold. I called a couple plumbing...
  8. Thanks for the reply. I was looking at an HTP...

    Thanks for the reply.

    I was looking at an HTP Elite. I noticed that Westinghouse is selling what looks like a rebranded HTP Elite. Home Depot sells them.

    Turns out one of the local...
  9. Thanks for your reply. I guess it is time...

    Thanks for your reply.



    I guess it is time to say that my current boiler is an NTI Ti 150.

    Here is the list of trouble I've had with it.

    First off, the air intake and exhaust are too...
  10. My current boiler is 94% UFAE, so I'm not sure...

    My current boiler is 94% UFAE, so I'm not sure where I would be saving a lot.
  11. Because they are less expensive and less trouble...

    Because they are less expensive and less trouble than boilers + fan coils ????

    Converting my house from fan coils to furnaces is not trivial. I'll go into the details if someone wants to know...
  12. A contractor just recommended replacing the 2 fan...

    A contractor just recommended replacing the 2 fan coils with 96% efficient condensing forced air furnaces and installing a new boiler to handle DHW, in floor heating and the garage fan coil. Hmmm...
  13. Thanks for all the help with this. The current...

    Thanks for all the help with this.

    The current boiler has a non functioning pressure sensor. It is running with the sensor jumpered out. As long as the loop pressure stays up, it is OK like...
  14. A related topic, how small can the primary...

    A related topic, how small can the primary circulation loop be ?

    It is going to be tight to fit 2 boilers into the space where 1 presently sits. The current primary loop needs redoing anyway...
  15. Thanks for the replies. It looks like I will...

    Thanks for the replies.

    It looks like I will be going with 2 Bosch boilers.

    Is there any advantage to 1 boiler being smaller ? Lets say I want a total heating capacity of 150K. I could go...
  16. 650181 ...

    650181

    http://www.cmhc-schl.gc.ca/en/inpr/su/sufepr/sufepr_001.cfm

    I live on the prairies. A heat pump system is way more expensive than a second boiler and the boiler in my house is 94%...
  17. If it was your house, would you install 1 more...

    If it was your house, would you install 1 more expensive boiler (Bosch) or 2 less expensive boilers (NTI or HTP) ?

    A boiler breakdown isn't really that big of a deal if there is a back up. The...
  18. Thanks for the input and discussion.

    Thanks for the input and discussion.
  19. The air and ground are too cold here for heat...

    The air and ground are too cold here for heat pumps. It has been tried and it doesn't work.

    The fan coils are 40K BTU each. If they both cut in at the same time, there is no way a 60K boiler is...
  20. It really irks contractors when home owners start...

    It really irks contractors when home owners start understanding some of this stuff.
  21. This is pretty interesting. ...

    This is pretty interesting. http://contractingbusiness.com/residential-hvac/condensing-boiler-caveat

    You need low water return temps in order for the boiler to be condensing and reach maximum...
  22. Any comments on the new fire tube boilers versus...

    Any comments on the new fire tube boilers versus the water coil boilers ? Are the new fire tubes that much better like the sales people say they are ?

    Has anyone had to repair a Bosch boiler ? ...
  23. That 100,000 BTU doesn't include the garage heat...

    That 100,000 BTU doesn't include the garage heat requirements, so 150,000 BTU isn't outrageous. Plus boilers are modulating and I can run it at lower loop temps in warmer weather, so I don't seen...
  24. I emailed the Bosch website after seeing the...

    I emailed the Bosch website after seeing the rating on the website I linked in. I haven't run into an installer yet who has heard of or installed Bosch boilers. The local Bosch distributor...
  25. That is the wrong answer. Installers and...

    That is the wrong answer.

    Installers and contractors have relationships with suppliers in the industry. They do not have access to boilers from every manufacturer. They will recommend what...
  26. I've had some of every type of failure. Our...

    I've had some of every type of failure. Our boiler is a wall mount condensing unit. I want to replace it with a similar unit.
  27. Thanks for the links. The HVAC system in...

    Thanks for the links.

    The HVAC system in the house generally works well. The issue I have is with boiler reliability. The current boiler has stopped working several times with no warning. ...
  28. This site suggests that the Bosch boilers are the...

    This site suggests that the Bosch boilers are the best.
    https://www.furnacecompare.com/boilers/top-rated-series.html

    I've never heard them mentioned in my area.

    This thread appears to back up...
  29. House specs. 2 story house. 6,000 ft^2 above...

    House specs.

    2 story house. 6,000 ft^2 above grade, 2,000 ft^2 basement slab heating, 80 gallon indirect hot water tank, 800 ft^2 garage with fan coils, cold northern climate. 9 foot ceilings...
  30. So what was the criteria for that list ? And...

    So what was the criteria for that list ? And which models from each manufacturer are the good ones ?
  31. Yes, the installation makes a difference. A bad...

    Yes, the installation makes a difference. A bad installation and setup played a part in some of the issues we experienced with our current boiler. However, given a proper installation and...
  32. None of these links work. I'd love to read the...

    None of these links work. I'd love to read the material if you care to upgrade the links.
  33. Who builds the most reliable/best 150K boiler ?

    The boiler (modulating and condensing) in my house is causing us grief. I won't tell you the brand. We want to replace it. I've talked to several specialists and each one tells me their boiler...
  34. Where to put the high efficiency filter ?

    My wife has severe alergies.

    We'd like to install 2 of these big high efficiency filters into the HVAC system in our house.
    ...
  35. We ran a blower door test and did some infra red...

    We ran a blower door test and did some infra red camera snooping yesterday.

    The house has a leakage rate of 0.215 volumes at 50 Pascals. It has an equivalent open area of 172 square inches. ...
  36. The home is airtight. We found a "fanless" heat...

    The home is airtight. We found a "fanless" heat exchanger hidden in the ducting allowing 150CFM or more into the house. Thus the low humidity.

    The fanless heat exchanger isn't high quality. I'm...
  37. I had a journeyman HVAC specialist in the house...

    I had a journeyman HVAC specialist in the house yesterday. He said its "as tight as a drum" leak wise. In his opinion a blower door test isn't needed.

    We inspected the existing Honeywell...
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    It turns out that a house needs way less than 5...

    It turns out that a house needs way less than 5 air changes per hour. More like 0.3.

    The required ventilation rate is then 52,000 ft^3 x 0.3 = 260 CFM.

    I'm thinking of installing 2 VHR...
  39. Thanks for the advice, TB. I don't think...

    Thanks for the advice, TB.

    I don't think there is any way that these homes (current one and the one we are moving into) have 150 CFM of fresh air infaltration. They are built way too tight.
    ...
  40. I think I'm going to install an AprilAire 700 in...

    I think I'm going to install an AprilAire 700 in each of the heat exchangers for the "normal" humidifying load and back them up with an AprilAire 800 downstream in the duct as needed.

    I'll run...
  41. A blower door test is an excellent idea. I'm...

    A blower door test is an excellent idea. I'm waiting for call backs from 2 such service providers.

    Lets assume these houses are pretty decent leak wise. Given the natural gas bill for the house...
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    Yes, in both the house we currently live in and...

    Yes, in both the house we currently live in and the new house. The new house has the booster fan setup, our current house doesn't.

    The HVAC room is in the basement on both of these houses. ...
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    I'm a fan of those systems too. My uncle has it...

    I'm a fan of those systems too. My uncle has it in his house. However, it would be nearly impossible to retrofit that into our new house.
  44. That is a very interesting idea. The new house...

    That is a very interesting idea. The new house is getting a Zwave automation upgrade, including the thermostats. It probably wouldn't be too hard to integrate control of the humidifiers into the...
  45. They appear to have insufficient capacity to keep...

    They appear to have insufficient capacity to keep the humidity up.

    FWIW, we currently live in a similarly sized house. Probably 4500 ft^3 finished on 3 levels, 10 foot ceilings on main and...
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    Big house air exchange ?

    We just bought a new (to us) house in Calgary, Alberta. Its a 2 story, built in 2007, 5,000 ft^2 finished, including the basement, 9 foot ceilings throughout.

    Its appears to be a very well built...
  47. Would the AprilAire 700 be better than the...

    Would the AprilAire 700 be better than the typical drum style evaporative humidifiers ?

    It seems to have a similar control to the 800 model, ie outside temp sensor.
    ...
  48. Best big home humidifier setup. (steam versus evaporative, etc.)

    We just bought a new (to us) house in Calgary, Alberta. Its a 2 story, built in 2007, 5,000 ft^2 finished, including the basement, 9 foot ceilings throughout. Hardwood everywhere on the main and...
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