Not getting enough hot water when using immersion heater

[midas]

I've had to temporarily start using my immersion heater for hot water as I'm running desperately low on heating oil.

My cylinder and immersion are only about 10 months old. The cylinder is quite large approx 1500mm by 450mm. The water does get very hot but we just don't get enough. If I feel the cylinder I'd say only the top half feels warm.
I turned the stat on the side of the cylinder up to 70 but it hasn't made much difference.
I was reading on some sites that some immersions only work up to 60 degrees is that correct?

The plumber that fitted it seemed like a cowboy. Charged over the top and had to keep coming back to fix seepages.

Would a large tank require a longer (bigger sized) / higher kw immersion?

I'm wondering whether the wrong size was fitted. Is there a way I can check this?

Is it easy to upgrade the immersion? The immersion fuse is rated at 16A.

Thanks for your advice.

 

[Tibbot]

Immersion will only heat water above it, not whole vessel. At least 27" element should be fitted. You can only check thermostat length as checking element would require draining. Top half heating seems normal for 1500h cyl.

As yours is indirect system, it's only intended as back-up. Direct (electric only) models would have another immersion installed lower down

 

[kevplumb]

I turned the stat on the side of the cylinder up to 70 but it hasn't made much difference.

 

[Tibbot]

I turned the stat on the side of the cylinder up to 70 but it hasn't made much difference.

Indeed.

 

[midas]

Immersion will only heat water above it, not whole vessel. At least 27" element should be fitted. You can only check thermostat length as checking element would require draining. Top half heating seems normal for 1500h cyl.

As yours is indirect system, it's only intended as back-up. Direct (electric only) models would have another immersion installed lower down

Thanks for your prompt reply. This really is a very nice forum!
All makes sense now.

Cheers