Boiler in garage

[Frogqueen13]

Hiya, we are in the process of converting our detatched garage into a playroom/office and I need some advice around heating/hot water

We are having a fuse board fitted and electrics but we wont have gas

What can people recommend?

Its a large garage

@pigletJohn are you around?

Tia

Frog

What is the hot water for? Hand wash is very different from shower.
Heating again what level of insulation do you have and what is the occupancy of the room? All day or short periods? And what comfort level?
What are your expectations of running costs? Electricity would cost getting on for quadruple the similar gas depending on your tariff.

Just for hand washing/paintbrushes etc no shower

Its brick built with a new roof and good insulation. It has double glazed windows

Prob used for a couple of hours per day

Your best bet would be to go for an under sink heater. Acts as a small hot water cylinder, but runs on electric. Something like this www.screwfix.com/p/ariston-undersink-water-heater-2kw-10ltr/3248g. Would still be best to get the water side, installed by a plumber as it's classed as an unvented cylinder and there are certain regulations that you have to follow.

No gas? Then it will be cold or expensive.

a large window, with lined curtains, facing south will capture some solar gain.

Line the walls with internal insulation before the plasterboard, and insulate the ceiling well. If you add a wooden floor, insulate over the concrete.

Presumably you don't have solar panels.

There might be scope for a clean-burn multifuel stove.

@Muchlywrong Isn't there a relaxation for heaters below 5litres?

If it's a couple of hours I'd recommend infrared heaters, you could run a couple of 2kw ones for 2 hours for not much more than a pound a time.
That would be more than you need so usually you could run them on a lower setting.
When you say good insulation do you mean to building regs for habitable room? Or better?

We are hoping to have very good insulation

It only has a tiny window atm but we are looking to change that. Love the idea of a stove!!!

As far as I know, the only real regulations that don't apply for 15 litres or less, is notification to building control. Was due to redo some training in two weeks, to refresh my information, but unsurprisingly, it has been cancelled.
I installed a 15 litre under counter heater 5 months ago for someone and to be honest it does give a lot of information in the booklet if I recall, it is more to do with running your prv to the tundish and waste that you can end up falling foul of. As @PigletJohn said though, Insulation will be the best thing for you in terms of keeping costs down. You can nowadays get 2kw wall heaters which are relatively inexpensive for small, sparingly used areas.
You could otherwise, run pipes underground to the building to supply heating and hot water. That is a very costly way of doing it though, as it has to be buried a certain depth, as well as Insulation, access to joints, etc etc. You would also need to check the boiler capacity and whether your hot water supply is sufficient for what you need.

We have a brand new fuse board and boiler in the house

Its all a bit overwhelming 🤦‍♀️

I wouldn't worry about it too much. Sometimes the simplest things are the best. Work out what you want to do with the area first. If it's a large space, it may be a good idea to create two or three rooms. As PigletJohn said, creating a "cavity" wall that is well insulated and then plasterboarded is probably the best way to go. This then should cut down on your costs for buying bits to heat the area/s, as well as the day to day costs. There is a certain amount that you can do yourself if interested, otherwise a builder should be able to kit it out in around a week or so, as long as the sparks and plumber can coordinate getting there whilst work is going on

We are keen on doing it mostly our selves jo we were thinking plumber & sparky first

The stud and insulate walls and ceiling

Then plaster or plastic cladding & get sparky in to finishe plugs lights etc then floor

the advantage of plasterboard is that it is fireproof.

Ohh thats good to know

It would probably be best to get your studding first, as it then allows cabling and pipework to be run hidden. Plus in the current climate, I assume you have spare time to get started on the studding relatively quickly.
You could also do some of the pipework for plumbing yourself if you just do it as a dry run. Best to use plastic piping for the plumbing, I would recommend hepworth over john guest, as you can do it in a continuous run in the studwork. Something like celotex is a good, cheap idea for insulation too.

Thats really helpful muchly