Temp gradient / air vs surface difference ?

[Smith123]

My bp is in a plastic tub rite now as he seems to prefer it, and is fine and eating . I have a 3ft viv that I have been playing with for his future home. But my questions are really regarding the temps as it will have overhead heat as opposed to his current belly heat . I have a reptile radiator ( habistat ) 75w on one side of the roof. I'm having an issue getting my head around what the temps need to be? Although he won't be moving into it for a while I would like to have it sorted and ready.
I have a temp probe inside the hot hide under the heater and in order to heat that to 90f it makes the roof of the hide over 100f, is that ok? The temp / humidity unit is in the cool end reading 75f and 62% humidity. If I raise the cool end above the 75f then the hot end will be even hotter ! Although the surface temps all the way down are quite warm 95-78.... Hope this all makes sense ? What is the most important and what should I focus on ?
Thanks

[KMG]

You are not going to be able to successfully heat the surface inside the hide with over head heat. Why don't you want to use a uth? That paired with what you have should be able to get you where you need to be.

If you have a good hotspot with a uth the entire tank can be the same temp. 77-84F is good.

[Smith123]

Right ok I see my problem! How do people that purely use ceramics as a heat source provide the correct hotspot then? I didn't want to use a heat mat as I've read they are not safe for heavy snakes? Also not safe inside wooden vivs ??
Thanks

[Smith123]

This is the future set up if the temps are ok, probe is now on floor directly under heat source. This reads 90 but the hide in warm end is a little lower as its off to the side to avoid the hide roof getting very warm? Any suggestions?







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[KMG]

I dont know why a heavy snake can't use a uth. My 30lb uses one just fine.

Is the rhp on a tstat? Is that the probe that is directly below it on the ground?

If it were me I would place the warm hide directly under the rhp and keep the top at what you want the hotspot to be. That should give it plenty of heat in the hide.

[Smith123]

If I put the hide directly under the heat, the roof of hide gets around 110f to get around 88 inside it? If I turn it down the cool end will be even less than 75! Using a mat for hotspot would make my life easier but it states everywhere no mat inside wooden viv even on a stat, thermal block burns etc etc... The heat radiator is on a dimmer rite now for testing which does the job. Is the very cool end being 75 a problem? He doesn't have to use it?
Thanks

[SRMD]

If you're from the UK you can always check out a vivarium heat mat holder, never used one but have saw them, it allows you to put the heat-mat inside the viviarium while being protected from water damage, thermal blocking etc..


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