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Thread: Heating system

  1. #1
    Senior Member Brett's Avatar
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    Heating system

    I find it interesting how some topics get talked to death but nothing ever happens.
    This car has been around for over 40 years and still nobody has come up with something that will work for a heater once the heater boxes are removed??


    Let me say right now I'm not the one that will put an end to the talks about finding a heating system for your cars after the heater boxes are removed. I see no reason to spend time and money on a solution since I have a Subaru engine and heating is not an issue with me but those who are in need of a heater and can't come up with a solution have peaked my interest as what is out there and what could be made to work.

    Here's what I came up with

    Circulation heaters for engines
    https://www.google.com/search?q=engi...&dpr=1#imgrc=_

    I found that a 12v heater with not come close to working in our cars and I figure VW did a lot of research and testing before they came up with their system. So I figure if you can't come off of the exhaust for heating I'd have to look at other options.

    Since 12v DC will not come close to doing the job then an inverter would have to be used to up the voltage and convert the DC to AC. That opens up a whole new world of options.
    I have not researched inverters for power draw and output, this is just exploring other options that could be available.

    From my short research the circulation heaters for engine blocks put out around 0-96*C and have a adjustable thermostat. (specifications differ from models of course)

    OK now you have something that will heat up water and circulate it.
    How to take the heat from the water and circulate it around the interior of the car??

    Toyota 4Runner around the years of 85-96 have a rear heater for their vehicle that is small and has a blower, hi/low switch,adjustable temperature control all in one setup. The 80's system differs from the 90's system slightly.

    Food for thought.

    I'm sure someone will find some reason why it wont work.
    http://www.euro-nova.co.uk/vb/attach...&thumb=1&stc=1
    http://www.euro-nova.co.uk/vb/attach...&thumb=1&stc=1
    http://www.euro-nova.co.uk/vb/attach...&thumb=1&stc=1
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  2. #2
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    I had thought of a modified hair dryer with an inverter, but I think the current draw is the problem there?

    Dirk

  3. #3
    Senior Member Phill's Avatar
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    Yes I agree - the problem is the amperage required to power any electrical heater which a car battery will struggle to cope with. Changing the voltage makes no difference to the current required. And if you're going to heat up water - why not just heat up air instead and cut out the middleman and associated losses?

    I'm thinking a petrol or diesel fuel driven heater may be the answer for an air cooled engine (without the advantage/problem of excess heat needing a coolant system). Either that or conventional heat exchangers as first propsed by VW engineers who probably knew best anyway..
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  4. #4
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    Quote Originally Posted by Phill View Post

    Changing the voltage makes no difference to the current required.
    That's not strictly true V x I =W voltage goes up amps comes down for the same power but I get where you are coming from at the end of the day you are coming from 12V so the current drain will still be equal or a bit more even using an inverter, but using the inverter does give you more options in terms of power W a 1500W hair dryer is available off the shelf I don't think you will find a 1500W 12 heater?

    Dirk

  5. #5
    Senior Member Brett's Avatar
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    I had to get educated on voltage. Didn't know it took 12v @ 125 amps to make 120v @ 12.5 amps

    With that said this place makes a heater that puts out 10,000 BTU and requires a 50 amp circuit @ 12v. Upgrading to an alternator that will handle the current draw maybe needed.

    !0,000BTU's is about 1/2 to 1/3 the BTU's that a heater that uses water as a heating agent uses. Still it should work for clearing a windscreen.


    https://dcthermal.com/product/sd12-5...ducted-heater/

    I personally thought technology on aftermarket heaters had progressed more than it had.

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