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WOW, this is the first I've seen of Rayner (though my partner met them at the last show he was at). Looks like a very well made cover from their description. Almost as good as ours (possibly better in one area if one goes with the sunbrella).
However, I have to question a few of their claims. Not that I don't necessarily believe them, but they're so unusual.
First, the R value they claim. According to their specs, foam density and thickness, the R value to claim is not based on standard testing procedures.
They claim their 4" to 2-1/2" tapered, 1 pound density cover is R-16 and their 2 pound R-21.
JUST the foam has an R value of;
1 pound = R-12.5
2 pound = R-14.1
This also brings up another question. A large, no, LARGE number of internet sellers are currently "fudging" in the claimed thickness area these days. The thickness and taper of the foam is suposed to be based on a 4' wide piece of foam (8' cover). The smaller the cover, the thicker the outer edge (since that's the part that gets cut of on smaler covers). Some are also adding in the added thickness of the vinyl to the stated thickness. A 4" overall thickness cover can be 10% less insulating that a cover with 4" foam.
The polyethiline wrapping the foam has an R value of R-0.85
Vinyl, does NOT make up the rest of that.
They are using Energy Sheild (we offer it as an option), but this has no more R value that standard scrim material used by most manufacturers. It does, or at least is claimed to, reduce heat loss through radiation, but radiant heat loss in not a consideration of R value.
Moving on........... 30 mil vinyl. Very unusual. I'm not aware of anyone that makes this thickness as standard. Though I do know, that if you buy in large enough quantities the vinyl manufacturers will do a custom thickness (we ourselves have a 32 oz that's custom made for us). Personally, I'd like to run some callipers over a sample to varify it.
"16-gauge aluminum channel". This is spectacular! I've never seen anything this thick being used in spa covers. And aluminum to boot, that's expensive (hey, did you know that guage thickness with aluminum is different than compared to steel.......e.g. the same "number" gauge is a different actual thickness. My recollection is there's about a 15% to 20% differnce.) Also, aluminum, while lighter than steel, if the same thickness, isn't as strong as steel. Sorry I don't have the resources at hand to compare the strength of 16g aluminum with the various thicknesses of steel being used.
I like the 6 mil. polyethylene vapor barrier. Besides us, they're the first I've seen to be using this.
what's the "Stainless Channeling" they talk of on their ordering page?
Pricing? OMG! Do their retail prices on their site include shipping? We make what I believe is a slightly better cover, delivered, for almost $100 less.
Last thing............ they say they have a 5 year warranty.Any idea what the limitations are?
: Many folks swear by Doc's covers. I have had tremendous success with the
: covers from Rayner Covering Systems.
PLEASE NOTE: We are Roberts Hot Tubs Inc. (manufacturers of traditional wooden hot tubs)! If you found this webpage through a search engine while searching for a different brand of spa, we are not them! We simply appeared in your search due to that name being talked about on this particular web page. The phone number below will reach Roberts Hot Tubs, not the manufacturer of the brand of spa you're searching for. This is a public forum and you're more than welcome to post a question asking for contact or other information for a particular brand of spa. Almost certainly someone will be able to assist you.