How long does it take your water to heat up?

[sjde]

We have a 375 gallon hot tub. On a refill , how long do you expect it to take for yours to heat up?

Ours just took 18 hours and that seems excessive. We figure the tap/hose water is about 50 degrees year round.  Outside temp was cool-40's- but that shouldn't matter since the spa is well-insulated.

[Spatech_tuo]

We have a 375 gallon hot tub. On a refill , how long do you expect it to take for yours to heat up?

Ours just took 18 hours and that seems excessive. We figure the tap/hose water is about 50 degrees year round.  Outside temp was cool-40's- but that shouldn't matter since the spa is well-insulated.

220V hook-up?

[bud16415]

I leave the cover open until the tub hits the air temp. Our tub same size as yours 240V and starting temp about the same i would guess about 12 hours. I have my fill hose hooked to both hot and cold water and if I'm in a hurry or doing a partial drain I can add up to 50 gallons of 150f water. That speeds it up a lot. I often use the hot water to top it off before we get in.   

[sjde]

Yes, 220V

[BullFrogSpasMN]

need more info on the spa itself, some manufacturers are putting heaters as low as 3.5-3.7kw all the way up to 5.5kw in 220V spas so depending on heater size it could take 16-18 hours, 12-14 for the larger heaters

[sjde]

I don't think I'd find that info in my manual but it's a Caldera Vanto spa. I did find this-
HEATER OUTPUT

Hi-Flow Heater (4,000 Watts)

[castletonia]

I would expect 10-12 hours for a Vanto depending on starting water temp.

[Ralith]

My 550g Artesian Island Margarita Elite took about 10-12 hours... approx 3-4 degrees an hour.

[sjde]

I shouldn’t have taken the salesman’s word for it . He said 8 hours. When I called the manufacturer she said 3-5 degrees / hour, so that’s 10-18 hours,  and it seems we’re on the longer end.