Hot water cylinder losing heat too fast

picasso · 3 Apr 2020

How long is the immersion heater and how tall is your cylinder ?

HERTS P&D · 3 Apr 2020

CHANGE THE VENT PIPE ASAP!

Andy

Marky_Sparky · 3 Apr 2020

It is 1500mm x 300mm foam lagged and the immersion is 27inch.

JohnD · 3 Apr 2020

having looked at your other pics, you have a lot more pipes that need lagging.

Are you sure the circulating pump is not sending water round? it can rob heat from the cylinder.

picasso · 3 Apr 2020

Marky_Sparky said:
It is 1500mm x 300mm foam lagged and the immersion is 27inch.

So your not even heating up half the cylinder, even a 36" will do just over half, don't suppose there is a boss for a bottom entry immersion heater ?

picasso · 4 Apr 2020

Or you could just put the vent back the way it was and lag it, your not losing much heat through the pipework if its lagged and your problem is more likely the way your using the system (your only heating about 50 litres of the cylinder with an average temp of about 55c)

hard-work · 4 Apr 2020

picasso said:
Or you could just put the vent back the way it was and lag it, your not losing much heat through the pipework if its lagged and your problem is more likely the way your using the system (your only heating about 50 litres of the cylinder with an average temp of about 55c)

That is worth doing at the first step, then monitor. But thick lagging to ensure the walls of the pipe do not cool too much. The heat is being wasted because of water circulation inside one pipe, so not allowing the pipe walls to cool too much is essential.

nwgs · 4 Apr 2020

hard-work said:
That is worth doing at the first step, then monitor. But thick lagging to ensure the walls of the pipe do not cool too much. The heat is being wasted because of water circulation inside one pipe, so not allowing the pipe walls to cool too much is essential.

Or fit a Navien combi. They are a really good alternative to a system set up

I have an Intergas at home with PDHW. It’s spectacular

hard-work · 4 Apr 2020

Wow. They would work well with a solar system. Both can take preheated hot water as the OP has.

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Hot water cylinder losing heat too fast

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