How to heat a standalone office / bathroom

onobed

Hi
I am building a standalone office with a bathroom. The bathroom is 85 squarefeet.
I live in Santa Cruz California. I plan to use electric radiant with a toekick heater for those times I need extra heat.

I have read that hydronic is better - but for such a small space, I don't feel the extra space and complexity of hyrdronic is unwarranted.

The rest of the office will be heated by a minisplit.

I do have hydronic in the main house - but I feel I will lose a lot of heat running the hot water the 15 feet to the office.

Thoughts?

Thanks in advance.

mattmia2

Running hydronic piping 15' will lose little if you insulate it. A mini split would be a great way to heat and cool. As always heat loss and heat gain calculations are the first step.

Jamie Hall

Santa Cruz? The minisplit will be ample for the office, and do you even really need additional heat for the bathroom?

mattmia2

There are mini splits that can use ductwork for distribution, maybe use that type to serve both rooms. AC likely is more of an issue than heat.

EBEBRATT-Ed

California just put some electric baseboards or an electric wall cabinet heater.

Intplm.

Look into a correctly sized Mini-Split system. You should be very happy with that considering your building size.

Dave H_2

I think the bigger question to ask is do you plan on AC in this space?

If not, cost wise, I would go hydronic. its already there, a little pipe and element, a zone valve and a little wiring, not too shabby!

If you are using a mini-split for the AC, well then that's a done deal cost-wise...

Lance

Dear Dave, I have done many of these before. For such a small space I recommend electric radiant for three reasons. 1) Independent zone and control 2) low expense installation. 3) Low cost in operation as usually a new space has superior insulation and a low heat load. 4) All my customers who did this were very happy with the results. Even if you choose a Heat pump for the office space, electric for the bath area is best where we size for 115% of the load. After all, this is a clothing optional room. and can also have its own control.

ethicalpaul

Mini split without hesitation. I'd never install resistive electric anywhere, but especially not in sunny California.

hot_rod

how large is the office portion? If you want cooling and some dehumidification, a mini split may be the best option and small sizes are available. Heat only for that size bath I would look at electric radiant from an install and cost of operation. Depending on boiler type and size, possibly run a hydronic loop.

EdTheHeaterMan

I have read that hydronic is better - but for such a small space, I don't feel the extra space and complexity of hyrdronic is unwarranted.

Double negative is unclear. is this what you meant to say?

I have read that hydronic is better - but for such a small space, I do feel the extra space and complexity of hyrdronic is warranted.

and 15 feet is nothing! Unless you forgot to place a zero at the end... 150 ft is still just fine. that is what they make pipe insulation for.

bill_brooks

when i built my house, hydronic radiant was a must. but...... even in the summer there are days when the
bathrooms needed a bit of heat. for this reason, i chose electric radiant. not only for cost upfront, but to
eliminate the need to fire my boiler for such small heat loads (60,75sqft.) i suppose i could have gone the
wall heater route, but i didn't want to listen to the fan noise. the floor-sensing stats were a bit pricey but
worth it.
the turn-down of my boiler, plus it firing a 40gal. buffer tank would not cause short-cycling. but there it is. i'm happy with my design.
BTW: firing the boiler into a buffer tank (rather than the heating zones) may seem unconventional. but
in high demand cycles it keeps the on/off cycling to much longer periods. a positive scenario.