What system would you recommend for this hotel?

[oz-plumber]

I'll take a guess!

Hot water: Rinnai HD50 + 315 ltr tank.

From the detail you provided in your OP

 

[Killy Bing]

I'll take a guess!

Hot water: Rinnai HD50 + 315 ltr tank.

From the detail you provided in your OP

More things to consider before appliances.

incoming main size, pressure, flow rates, need for accumulators or booster sets.
system layout, pipesizing, fed from a single location or multiple appliances.

I would hazard that you would want a few of those units cascaded together.

 

[happyflyer]

Bet he wished he'd never asked, the roof just came in on him, maybe he will think twice next time.

 

[Killy Bing]

Bet he wished he'd never asked, the roof just came in on him, maybe he will think twice next time.

Happy to give pointers with more info but having had to sort a b and b out its a headache

 

[bright spark]

You could always check out an ACV Heatmaster. It's a single package unit, a boiler that heats a cylinder above it. Fast recovery times for hot water, and it also has the capability to heat radiator circuits as well. Check it out on the net.
A quinta pro with rad circuits and a glass lined cylinder fed off a low loss header would be another way.

 

[Ermintrude]

Main multi points and electrical convectors?

 

[happyflyer]

I spend most of my days now putting systems right that have been put in wrong, oversize is just as bad as under-sized, get some help like people say, HWS demands can be a pig and catch you out, even the experts get it wrong, usually too big, frightened to make a mistake.

Tony

 

[hammers4spanner]

like i said in earlier post contact rinnai

they will send some one out to do a site survey and will issue design spec

 

[oz-plumber]

More things to consider before appliances.

incoming main size, pressure, flow rates, need for accumulators or booster sets.
system layout, pipesizing, fed from a single location or multiple appliances.

I would hazard that you would want a few of those units cascaded together.

That stuff is generally not taken into consideration when sizing hot water units.
That's pipe sizing and system design.

Sizing hot water units is taking peak demand usage and selecting a system that can cope with the peak demand

For a place of that size - relatively small - I would always use a storage tank instead of cascading units together.
There is no way that the peak demand for that place would be over 1000 litres in the first hour.

 

[Killy Bing]

That stuff is generally not taken into consideration when sizing hot water units.
That's pipe sizing and system design.

Sizing hot water units is taking peak demand usage and selecting a system that can cope with the peak demand

For a place of that size - relatively small - I would always use a storage tank instead of cascading units together.
There is no way that the peak demand for that place would be over 1000 litres in the first hour.

but no point even specing anything if it cannot be supported in the first place.

 

[happyflyer]

like i said in earlier post contact rinnai

they will send some one out to do a site survey and will issue design spec

Good idea they will carry the responsibility of the design, I think a few others companies would do the same