"Smart" central heating systems

oggiet said:
Just had a quick look, it's very interesting and correct what you are saying. Apparently Tado will override control of flow temp even if there is outside temp reader..... automatically runs it at highest flow temp.

When we move we will need new boiler, might get heating specials to come and do our installation. Learn something new every day though, thank you.
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Highest flow temp isn't the best idea. For maximum efficiency and lowest carbon consumption, you want the lowest flow temperature with the highest dT.

@b0rn2sk8 fully agree with what you're saying
 
Unless your going to get a heat pump, it’s unlikely any ‘heating experts’ will deliver what you want without you telling them what you want.

Most heating firms just bang in gas boilers using out of date rules of thumb and don’t actually consider the system design or heat loss of the property when doing it. The result is typically systems that don’t perform to their rated efficiency.

They get away with it because gas boilers don’t measure their own efficiency so the owner doesn’t actually have a clue as to how well it’s performing. There have been some general incremental improvements to boilers to improve their efficiency generally.

So when an oversized boiler what’s already performing below its spec is replaced with another that performs below its spec the owner doesn’t know any better because their bills are slightly less from those general efficiency improvements. They are usually blissfully unaware of the performance they are leaving on the table.

The TLDR is that you’ll likely need to do your own research and be specific with what you want.
 
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b0rn2sk8 said:
Unless your going to get a heat pump, it’s unlikely any ‘heating experts’ will deliver what you want.

Most heating firms just bang in gas boilers using out of date rules of thumb and don’t actually consider the system design or heat loss of the property when doing it. The result is typically systems that don’t perform to their rated efficiency.

They get away with it because gas boilers don’t measure their own efficiency so the owner doesn’t actually have a clue as to how well it’s performing. There have been some general incremental improvements to boilers to improve their efficiency generally.

So when an oversized boiler what’s already performing below its spec is replaced with another that performs below its spec the owner doesn’t know any better because their bills are slightly less from those general efficiency improvements. They are usually blissfully unaware of the performance they are leaving on the table.
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Any tips where to educate myself or who to ask for help when the time comes ?
 
Have a look on the heat geek YouTube channel, it’s focussed on heat pumps but all the system design stuff is identical regardless of heat source.

Then have a go at mapping your house out on the heat punk website which will give you an estimated heat loss and required radiator sizes for each room for a given flow temperature.

The only thing you sacrifice when lowering the flow temperature is reaction speed. It will take longer to heat a house from cold but taki no more time at a flower flow temp will use less gas than less time at a higher flow temp so you just run it for a bit longer.

The lower you can get the flow temperature, the more efficient the system. The lower the flow temperature the bigger radiators you need and there is a balance to be struck between radiator sizing, flow temperature and frankly, how things look.

Many houses have oversized radiators already and that combined with the high flow temperature causes lots of cycling and reduces efficiency. You might not need to change any to get the flow temp right down.

Anything below 50 is actually fully heat pump ready and it should match the running costs of a good gas boiler. Lower than 50 will beat a gas boiler.
 
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