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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

    Immersion heater hot water bath

    Hi, I am looking to build a DIY hot water bath, I was planning on using a small screw plug immersion heater, drilling a hole into a polypropylene tank and using a nut/gasket to seal it. Recon it could work?
  2. J

    Britony II T gas water heater 'hunting'

    When a hot water tap is opened, everything is fine. When a shower is used, there isn't enough flow to keep the water heater happy, and after a minute or so it turns off its burner and waits for a minute while the hot water runs cold, then turns the burner back on and repeats that cycle...
  3. M

    Gas heater installer required.

    Hi, Looking for a gas safe heater installer in the NN4 region. Want to remove old open gas fire with controls at the bottom from a chimney breast and install a new, more efficient, glass fronted gas heater with controls at the top or sides, must be suitable for a disabled user. Thank you.
  4. I

    Immersion Heater or Water heater

    I do not live in the UK so not always familiar with the right term. My mother has a flat in London that needs a new immersion heater to heat hot water for bathroom and kitchen.. She currently has an electric one that is very old and needs replacing. I went to B&Q, Homebase sites to look for a...
  5. Z

    Rinnai Infinity 16i gas water heater - no boiler fittings

    Hi, just purchased a Rinnai Infinity 16i gas water heater from Mr. Central Heating. Boiler and flue arrived but fittings are missing. Its got 3 x 1/2 BSP brass male connectors coming out of boiler. What's needed and where do I get it from? Gas installer advised that these should have come with...
  6. L

    Help with immersion heater

    Hi I have had problem with a 3 phase immersion heater, I installed it into a gravity system about 3 months ago and it stopped working after about a month. It was installed into an existing gravity cylinder which is on bottom floor of a large office block. The cwsc is in roof space and is the...
  7. S

    secondary return for small 15L heater?

    Hi guys , planning a job which is comming up shortly , basically need to supply hot water for 3 basins , 2 of which are far enough away that i would say need a secondary return , i have picked out a 15L unvented water heater by hyco {sf15K} , which would do the job nicely but ideally need a...
  8. G

    Britony llT water heater

    Looking for someone who can service this, suspect it needs new diaphragm, and check spindle and water governor etc. Intermittent goes cold, probably with variations in incoming mains pressure. Twickenham area, easy parking. Many thanks.
  9. G

    britony IIT water heater service in TW7 Isleworth

    Anyone know someone that still remembers how to service these? not just a quick look I am afraid, needs new diaphragm and check spindle, filters, and maybe water governor. not been serviced for a while by the looks of it. Isleworth TW7 area. Parking OK. Let me know if you can recommend...
  10. L

    Installing new plinth heater 10mm pipe

    My house is fitted with 10mm pipe for whole heating system and I am putting in new kitchen so a plinth heater is the way to go. Chosen a smiths over myson as most people recommend it. Question is to join heater I need 15mm so how close should I be before upscaling pipe. The heater is bigger than...
  11. S

    Heatre Sadia multipoint water heater

    Anything wrong with this?
  12. G

    Advice needed - Santon Premier TP210E Unvented Water Heater

    Hi, Firstly, thank you in advance for reading and any advice is greatly appreciated. I have recently purchased a flat with only electric and the hot water comes from the Santon Premier Unvented Water Heater (model number TP210E). As I am new to this I was wondering what is the most cost...
    • Gracechurch
    • Thread
    • advice heater needed premier unvented water water heater water tank
    • Replies: 14
    • Forum: Plumbing Jobs | The Job-board
  13. J

    Is there a programmable stat that can also do immersion heater?

    Hello, Looking for help with finding a suitable controller. Customer has oil Aga for central heating and hot water - simple enough. However over the summer months it gets shut down and any heat requirements are met by wood burner and hot water is produced electrically via cylinder immersion as...
  14. I

    Main Mersey Water Heater not lighting on hot water

    I was originally called to this as the pilot was going out. I changed tthermocouple and then the boiler would not light the burner when the hot tap was switched on. I suspected the diaphragm. This was ok, but on checking the gas valve below the burner. Water had leaked into it from the...
  15. K

    Which electric heater to use with wet UFH?

    Hi ive built a 6m x 4m summerhouse at the end of my garden. its a block construction with insulation and timber cladding. I have the ufh pipework set into 65mm of screed and would like to heat the water using an electric inline heater. Any bright ideas on which electric inline heater is best...
  16. Neil T

    Electric water heater installers needed

    Hi all, I have a customer who is looking for water heaters in a bar/ restaurant in Manchester. The building doesn't have a gas supply so the heaters need to be electric. Also, as it's a bar/ restaurant, it would more suitable to have a twin heater system in case of a breakdown. I'm carrying...
  17. G

    Bath mixer or immersion heater

    Hi Bath mixer tap is running too hot in shower, almost scalding. Other taps seem mostly good temperature. However there is immersion heater in flat. How do I differentiate whether element stat or mixer tap is failing.
  18. T

    Ideal Independent C24

    Hi, had the above convection heater for 4/5 years. The C/H is excellent, but problem with domestic water heating. It flicks onto the heating symbol and the heater fires up. However after a while it goes off and the water runs cold. Takes an age to get it firing again. Also if I run the flow...
  19. hammers4spanner

    Chaffoteaux water heater

    Long story short friend who does installs has changed a diaphragm on one of these as it initially had luke warm water . Had a call today saying that now it won't even start up at all and the water is stone cold.Gone over and told cust that for starters kitchen fitter has put shelf right under...
  20. R

    Query re. domestic unvented electric water heater

    All, In my third floor London flat, I have a water heater that is about 20 years old. The tank does not have a separate cold water storage tank. The plumbing is complex (illustrated in the diagram below) and is displaying some anomalies. The tank is fed from the cold mains supply via a...
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