Gas v Oil

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I have a 20 year oil conventional oil boiler in a 3 bed bungalow.  The boiler works Ok but I'm told is 30% inefficient. As we are refurbishing the property now is the time to consider replacing the boiler.  Should I go with gas or oil?

I'm told new oil boilers can run on HVO which is a non fossil fuel and therefore green but more expensive to buy.  Let's assume for the time being I would run on oil.

If I opt for a conventional oil boiler I could in time add solar thermal where solar heat with be retained in a thermal store.  The oil option is a combi boiler which I'm told do not have such a long lifespan.

The other option is a gas combi boiler.

What's the best option please?



Comments

  • molerat
    molerat Posts: 32,012 Forumite
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    What about ASHP ?  If you are doing a property refurb maybe now is the time to look in that direction.
  • QrizB
    QrizB Posts: 13,822 Forumite
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    Is mains gas available to your property, or are you comparing oil to LPG?
    Personally I'd say the order of preference is:
    1. Mains gas
    2. Oil
    3. LPG
    Oil is generally slightly cheaper than LPG, plus you don't have to deal with LPG suppliers ...
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  • EcoScruples
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    If you were going oil again you would have to have a condensing boiler fitted as per current regs, those are well above 90% efficient now.
    I use an oil fired boiler as I don't have access to mains gas although I'd chose that for convenience if I could.
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  • markin
    markin Posts: 3,854 Forumite
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    edited 25 October 2022 at 2:29AM
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    No one uses solar thermal, Its better to just use all roof space for PV and use a diverter for the hot water tank, 8-9 months a year the tank will be hot by 11am and then the roof space can be useful for making power for the rest of the day.
  • Mister_G
    Mister_G Posts: 1,928 Forumite
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    QrizB said:
    Is mains gas available to your property, or are you comparing oil to LPG?
    Personally I'd say the order of preference is:
    1. Mains gas
    2. Oil
    3. LPG
    Oil is generally slightly cheaper than LPG, plus you don't have to deal with LPG suppliers ...
    I think that you'll find that LPG is currently cheaper per kWh than oil by about 25-30%.

    A lot of LPG users on here are paying 40-45ppl, considerably less than the current oil price of 90ppl.

    LPG produces 2/3rds the heat of oil per litre, but that still makes it a lot cheaper per kWh.

    I'll concede your point about dealing with the "wild west" LPG market though!

    I'm fortunate to have a very good local supplier.
  • drsquirrel
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    LPG users pay standing charges, Oil do not.

    Their wording of 30% inefficent is odd, you're likely getting 70%+ anyway which isn't abnormal, modern ones only get over 90% in certain circumstances too so its not a sudden 30% leap. 15% mainly? Depends on how well you manage it.

    I doubt you're going to save much, from your other post their quote of 8k is crazy, should be closer to 3k maybe less. I still don't think its worth it - if its "getting old" then maybe a burner upgrade.

    If you combine this with solid fuel heating or similar I defniately would not push for a new condensing boiler (unless yours actually fails).

  • armistice
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    Mister_G said:
    QrizB said:
    Is mains gas available to your property, or are you comparing oil to LPG?
    Personally I'd say the order of preference is:
    1. Mains gas
    2. Oil
    3. LPG
    Oil is generally slightly cheaper than LPG, plus you don't have to deal with LPG suppliers ...
    I think that you'll find that LPG is currently cheaper per kWh than oil by about 25-30%.

    A lot of LPG users on here are paying 40-45ppl, considerably less than the current oil price of 90ppl.

    LPG produces 2/3rds the heat of oil per litre, but that still makes it a lot cheaper per kWh.

    I'll concede your point about dealing with the "wild west" LPG market though!

    I'm fortunate to have a very good local supplier.
    Current oil price seems to be 66p / litre

    Just to add some number to that for comparison:

    1 litre of LPG = 7.08 KWh
    1 litre of Heating Oil = 10.35 kWh

    Using 45p lpg is 0.45/7.08 = 6.4 p per KWh
    A quote from boiler juice (1000l for my local area) = 66p per litre = 0.66/10.35 = 6.4 p per kwh

    Didn't expect them to be the same!







  • Mstty
    Mstty Posts: 4,209 Forumite
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    edited 28 February 2023 at 6:02PM
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    armistice said:
    Mister_G said:
    QrizB said:
    Is mains gas available to your property, or are you comparing oil to LPG?
    Personally I'd say the order of preference is:
    1. Mains gas
    2. Oil
    3. LPG
    Oil is generally slightly cheaper than LPG, plus you don't have to deal with LPG suppliers ...
    I think that you'll find that LPG is currently cheaper per kWh than oil by about 25-30%.

    A lot of LPG users on here are paying 40-45ppl, considerably less than the current oil price of 90ppl.

    LPG produces 2/3rds the heat of oil per litre, but that still makes it a lot cheaper per kWh.

    I'll concede your point about dealing with the "wild west" LPG market though!

    I'm fortunate to have a very good local supplier.
    Current oil price seems to be 66p / litre

    Just to add some number to that for comparison:

    1 litre of LPG = 7.08 KWh
    1 litre of Heating Oil = 10.35 kWh

    Using 45p lpg is 0.45/7.08 = 6.4 p per KWh
    A quote from boiler juice (1000l for my local area) = 66p per litre = 0.66/10.35 = 6.4 p per kwh

    Didn't expect them to be the same!







    Thanks for the calculation.

    So considering not everyone will have a good cheap local supplier for LPG like @Mister_G it is likely oil is in fact the cheaper of the two fuels right now.
  • macman
    macman Posts: 53,098 Forumite
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    If the OP has mains gas available, then the discussion is fairly irrelevant. OP, please clarify. 'Gas' tends to mean mains gas, tank gas is referred to as LPG.
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