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Heating, ventilation, and air conditioning (HVAC) is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. "Refrigeration" is sometimes added to the field's abbreviation as HVAC&R or HVACR, or "ventilation" is dropped, as in HACR (as in the designation of HACR-rated circuit breakers).
HVAC is an important part of residential structures such as single family homes, apartment buildings, hotels, and senior living facilities; medium to large industrial and office buildings such as skyscrapers and hospitals; vehicles such as cars, trains, airplanes, ships and submarines; and in marine environments, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors.
Ventilating or ventilation (the "V" in HVAC) is the process of exchanging or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air. Methods for ventilating a building are divided into mechanical/forced and natural types.

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  1. D

    Tankless Water Heater in Closet

    'd like to replace this with a tankless water heater. We live in a condo and this currently power vents out to I believe the roof. We are on the 3rd floor of a 4 floor building. Can I replace this with a tankless water heater? Will there be enough combustible air around the unit? Can it...
  2. K

    Looking for answer to water heater sme

    At our wits end. Remodeled a farm house in 2020, installed the water heater and due to appliances being backordered couldn't move in until Nov. of that year. After a hot shower we noticed a terrible smell. We had the lines smoked, venting tested, used a camera on the lines, all from a local...
  3. M

    Water Heater Leaking from back of heater

    Hi we have an Ariston new europrisma 10 UR 3KW heater and it has started to leak from a hole that is covered with tape at the back of the heater. I have tried to find something that explains what this hole is but can't find anything. The heater has been in about 3-4 years and only started...
  4. DJseals

    Immersion heater replacement

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  5. J

    Immersion heater noise

    I had a new water heater element fitted a few weeks ago that heats water at night on economy 7. Previous heater elements have been very quiet but I can hear the new one heating the tank at night. It sounds a bit like a boiling kettle. Is this normal? It’s driving me mad!
  6. D

    Unvented water heater advise

    Been to a site today and every sink has a 15l water heater underneath on each of the prv's discharge after the tundish their is only about 200mm of 22mm copper before it enters the sink waste below each sink been like this 10+ years their is no other pipework local to each and most of the...
  7. D

    Ariston Next Evo X SFT multipoint water heater. Temperature issues.

    Hi all:) This is my first post here. My Dad recently had an Ariston Next Evo X SFT 16L multipoint water heater installed to replace the previous one that was leaking. What concerns me is that it basically takes about one and a half minutes for the water to reach even a a basic useful...
  8. W

    Do I need to shutdown water heater if main is shut off?

    I noticed the other day, I had to repair a leaky valve that fed water to the refrigerator and washing machine. I noticed after I turned the main water off, that, after cutting the pipe... a bunch of hot steaming water came out. I didn't expect that to happen. Another Texas winter event is...
  9. J

    Electric water heater - recommendations?

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  10. P

    Megaflo Heatrae Sadia Immersion Heater Replacement TSE v TSR

    I know this topic may already have been covered but I just wanted to address it again. Can someone please tell me what the difference is between the teal green thermostat and the white one? (see attached photos) I have one of each in our Megaflow, one operates the Economy 10 and the other is...
  11. F

    Immersion heater coming on too early

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  12. C

    Problems with a Fagor water heater

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  13. M

    immersion heater failed after 4 months

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  14. J

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  15. B

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  16. M

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  17. A

    What instant water heater should I get?

    Hi. I've taken my immersion heater out and want to replace it with an instant hot water heater. The unit will be placed on a wall at chest height from where the immersion heater control was sited (Horstmann economy 7 quartz) The fuse on the fuse board says it's a 16A. I only need it to heat...
  18. E

    Anyone know what is wrong with this Water Heater?

  19. J

    Water heater for Shepherds hut

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  20. L

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