fillin Da tub

joel_19

Ok I've got a customer putting in a MTI Maximus MTDS-53 tub. This is the biggest fill/drain tub I've ever seen. It requires 158 gallons for a minimum fill ( to cover the jets), 242 gallons max fill. We have A little over 100k BTU of boiler to work with. I'm thinking i need Two 120 gallon Crown Inderects to fill it. Any other ideas? Can't use a Bosch or Rinnai or anything no gas available. I want stainless tanks no glass or stone lined. Tough thing is the competition says a single 80 ought to handle it . Not!! I don't think they did the research to see what this thing holds.This of course makes the customer think I'm trying to rip them off. Sigh.. it aint easy being me...

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S Ebels

Stick to your guns

You know as well as I do what will happen when they try to fill that swimming pool out of an 80 gallon heater. The thing probably has a 12gpm or better faucet on it too, right?

There's no way that a 100K boiler is going to keep up with that amount of demand through an 80 gallon tamk. Do the math and show your customer on paper what they are up against. 80K input gives you about 2 1/4 gpm at a 70* temp rise. Filling that tub would take 2 hours at that rate.

Another thought:

If you go the big storage route and have dhw priority, you are going to be shutting off the heat in the house for at least a hour and a half. This might not be acceptable either. (grin)

You have to add some serious BTU's somewhere in the scenario or they are going to have a cold house while the boiler recovers that much DHW.

Good luck, you're on the right track, don't let the dodo with the 80 gallon tank derail you.

joel_19

yup

Question is, is there a Better way to fill that sucker. I don't love the thought of 240 g of water standing around loosing heat just to fill a tub maybe 3-4 times a month at best. Since I'm limited in BTUs what about a 80 or 120 indirect piped in series with a couple big electric water heaters. They would be mostly heated with the indirect , so they would just need the electric elements to maintain during standby. hopefully? controllinh the electri cost. The tub Faucet is 5gpm good for me but it'll take like 30 minutes just to get the water up to the jets. Of course they'll probably change that to a firehose at the last minute.

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Mike T., Swampeast MO

Is there room in the budget for a big, dedicated instant heater? 5 gpm faucet seems VERY under-sized for such a big tub. I was imagining two big 3/4" Roman fillers...

Sure hope that tub has a built-in heater to keep the water up to temp! After taking that long to fill, it won't take the water and air jets very long to cool the water significantly.

Uni R

Would one or two of these work?

> Question is, is there a Better way to fill that

> sucker. I don't love the thought of 240 g of

> water standing around loosing heat just to fill a

> tub maybe 3-4 times a month at best. Since I'm

> limited in BTUs what about a 80 or 120 indirect

> piped in series with a couple big electric water

> heaters. They would be mostly heated with the

> indirect , so they would just need the electric

> elements to maintain during standby. hopefully?

> controllinh the electri cost. The tub Faucet is

> 5gpm good for me but it'll take like 30 minutes

> just to get the water up to the jets. Of course

> they'll probably change that to a firehose at the

> last minute.

>

> _A

> HREF="http://www.heatinghelp.com/getListed.cfm?id=

> 254&Step=30"_To Learn More About This

> Professional, Click Here to Visit Their Ad in

> "Find A Professional"_/A_

Uni R

Would one or two of these work?

http://www.toyotomiusa.com/products/OM-148.html

Tankless and uses #2...

hr

No gas available??

what powers the 100,000 boiler you have? It will take quite a while to recover those large tanks with only 100,000. Is that input or output?

hot rod

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Ray Landry

Hey Joel could you get propane to this home? If so you could go with a few rinnai instant water heaters piped in tandem. Just get your flow rate for the tub, and anything else in the home that requires hot water, and call the water heater manf. themselves. They will usually size it for free. On a site note I'm from the metropolis of Mendon too... My friend Matt Teed works for you guys..

joel_19

No gas for you

Like The soup Nazi No Gas for You !!!!! oil Fired

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joel_19

Ray

Are you a H.O. or do you work in our industry? As a tech? or for a holesaler?

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Unknown

NO GAS FOR YOU!

Joel,

Since Da Tub will only be used infrequently, you might want to concider using an instantanious electric unit. Stiebel Eltron makes an awesome point of use heater. I have used their products and they work very well. These units will require some serious current flow so large wire (probably #6AWG) is needed. Have an electrician check the job and service panel out beforehand. I'd venture to say that this is the ticket for what you describe.

LPG is going for $2.85/Gal in New England right now so I understand your reluctance to use gas. A couple indirects don't make sense to me with that kind of demand drawing from your relitively small boiler.


Check out their website: http://www.stiebel-eltron.co.uk/vIndex.htm

tim smith

dhw amounts

One other way to do this is one 120 or 140 gals tank, store at 160 degrees. put tempering valve at tank to prevent scalding. This with a little calculating I think would do what you want. Good luck, Tim

Ray Landry

Joel I'm a tech for Rodenhiser Plumbing & Heating

Mark Eatherton1

Don't forget...

you'll only be able to draw 80% of the tanks stored volume before mixed dillution kicks in, so if you NEED 240 gallons, divied 240 by .8 to get the proper stored volume required to deliver the goods...

ME