From what I understand, New Gas boilers are generally hydrogen-blend ready but non are currently suitable for 100% Hydrogen currently.
Taken from British Gas website:
Stage 1: – New boilers will be built to a new ‘hydrogen-ready’ standard, which means they’ll work with natural gas but can also be easily modified to run on 100% hydrogen. According to some industry estimates, these boilers should be available from 2023-2025.
Stage 2: – A 20% hydrogen blend will be introduced into the gas supply. Most boilers will be able to use this as normal – including all new British Gas boilers. The rollout of 20% hydrogen isn’t expected to begin until 2028 at the very earliest.
Stage 3: – When the gas supply switches to 100% hydrogen, every new boiler sold in the UK will simply be a hydrogen boiler. This is the ultimate goal, but it probably won’t happen until the mid-2040s.
https://www.britishgas.co.uk/the-source/greener-living/hydrogen-boilers.html
Air Source vs. Ground Source Heat Pumps
Air source and ground source heat pumps absorb heat from renewable sources – compressing this heat into a higher temperature for heating and hot water.
Air source heat pumps:
Air source heat pumps use heat energy from the air to ‘pump’ higher temperature heat into a building. The efficiency of an air source heat pump varies across the seasons and time of day. They can be especially problematic in winter because when you need heating the most, the air – its source of energy – is at its coldest, and the unit will require more electricity to operate efficiently.
The true efficiency of air source heat pumps can be difficult to ascertain. Their performance in test conditions is usually based on an inlet temperature of 7°C, which is not realistic, as the air temperature fluctuates. On the other hand, ground source heat pumps are tested by their performance with an inlet temperature of 0°C – representing true climate conditions.
Ground source heat pumps:
The ground can maintain temperatures of 10-12°C all year, which means the average ground temperature in winter will always be significantly warmer than the average air temperature. As a result, the source temperature for a ground source heat pump on the coldest day can be up to 15°C warmer than the cold air coming into an air source heat pump.
This means no unexpected spikes in electricity use, as a ground source heat pump does not have to work as hard to upgrade the source’s energy into usable heat for space heating and hot water – making it more efficient for heating and hot water systems.
Unlike air source, a ground source heat pump also offers efficiency in terms of operational times. Using smart controls and time-of-use tariffs, a ground source heat pump can participate in load shifting, where times of electricity consumption can be shifted to low-cost or low-carbon hours.
Ref: https://www.kensaheatpumps.com/air-source-vs-ground-source-heat-pumps/
Ground source heat pumps require digging and laying of the pipes etc., air source heat pump is fitted much like an AC unit and both Ground and Air source heat pumps need a large capacity hot water tank located inside the premises etc.
In a completely sane world, madness is the only freedom (J.G.Ballard).
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