[Dave Willis]

cracking! 

[JandS]

Must take a while to get hot to the brush through 100m of hose laid on a cold surface.

[Smurf]

The fastar 8l heater has a lag like every type of heater does when starting from cold.  Just takes as long to flush any cold water out of the hose reel to get hot water to the brush that's all.  Same thing would happen using pre heated water pumped directly from a van tank.

That heater has a winter & summer setting but as of yet I've never had the need to switch it over to winter (twin burner setting)

[Nathanael Jones]

I haven't cleaned a single pane in over 3 years and I'm still getting the blame! 

When I first got my setup I couldn't find any specific regulations anywhere, so just went with common sense - stickers on the outside of the van, installed a roof vent for the exhaust fumes, and I drilled a few holes in the floor to allow any leaking gas to escape.

I also informed my insurance (got their approval in writing), and made sure to switch off the gas at the regulator if driving more than a couple of minutes between houses & overnight.

This debate has been going on for years by window cleaners.
I blame Nat Jones myself as was one of the first to post a vid years ago 

[Smurf]

Sorry Nat I could not resist 

[Tosh]

The fastar 8l heater has a lag like every type of heater does when starting from cold.  Just takes as long to flush any cold water out of the hose reel to get hot water to the brush that's all.  Same thing would happen using pre heated water pumped directly from a van tank.

That heater has a winter & summer setting but as of yet I've never had the need to switch it over to winter (twin burner setting)

First thing I did. I aim for hot out of the brush, not lukewarm.

Even that isn’t hot enough for me, Im switching over to an L10 soon as. The Faster is a good heater, but I run my pump on max with 8mm hose, the Faster struggles to keep up if I want hot.

Thing about the Fastar compared to the L5 is Ive found it a lot more reliable as a boiler, the flame certainly doesn’t blow on it which was a real bug bear for me and the L5.

[Smurf]

That supprises me slack as I can run that heater at 60c with the pump flat out no probs.
How hot do you want the water?

[Tosh]

The temp dial will say 60 at the boiler but by the time it gets to the brush its colder.

You also run your brushes on a slower LPM of water which means the water will heat up easier and quicker than mine.

Im just looking at this one, its by the same crew as the 8L jobbie, problem with the L10 it hasn’t got a temp dial on it, this one and the 8L do.

http://www.ebay.co.uk/itm/12L-GAS-LPG-Hot-Water-Heater-Tankless-Stainless-Instant-Boiler-With-Shower-Head-/261325320793?hash=item3cd833f259:g:OR8AAOSwHnFV49uF

[Smurf]

What lpm is the pump you use flat out?

Maybe spruce could answer the tech question if that one would be any good or too large for your needs.

[Smurf]

That 12l version looks  cheap enough so why not just you get one and let us all know if it works 

[Tosh]

What lpm is the pump you use flat out?

Maybe spruce could answer the tech question if that one would be any good or too large for your needs.

10LPM.

[Smurf]

What lpm is the pump you use flat out?

Maybe spruce could answer the tech question if that one would be any good or too large for your needs.

10LPM.

Oh I understand now. In that case you defo need a bigger heater to cope with the demand.

[Tosh]

Actually I think it's 12.

[Tosh]

I'll check tomorrow.

[Spruce]

Didn't someone on here once buy a 12lpm heater a number of years back? He didn't have enough flow to ignite it using a 5lpm pump.

However, as Slack has a higher delivery pump it may just work for him.

The 8 liter unit is a 16kw boiler whereas this one is a 24kw boiler. It will use more gas and will heat the water inside more quickly even at a faster flow.

The viscosity of water changes when it gets heated. I found that we got more hot water through the hose and brush heads than we did with cold (9 degrees) using the same controller flow settings.  So you might have an issue getting the heater to ignite when the water is cold in the hose reel. You can also only get so much water through minibore hose no matter how 'big' the pump is.

I think it will be one of these suck it and see. Slack is thinking of going where no window cleaner has been before. 

Personally, my gut feeling says to me that the heater is too big for our application, but I don't have an experience with faster flow pumps being used in this situation.

.

[Tosh]

Thing is the hotter the pipe gets the more it will expand, thus allowing more water through. 

[Nathanael Jones]

I've used 10L and 12L heaters - - I found that when it was really frosty & I only wanted lukewarm water (I didn't want to break any panes from thermal shock) that the minimum setting on both was still too hot.

I found 8L to be the sweet spot for me,.. but if you've got a really high flow rate then you might get away with a bigger unit.

[Spruce]

Thing is the hotter the pipe gets the more it will expand, thus allowing more water through. 

...... so what you are saying is that if you change over to 1/2" hose it will expand to the same size as the fire brigade use.

[Tosh]

Thing is the hotter the pipe gets the more it will expand, thus allowing more water through. 

...... so what you are saying is that if you change over to 1/2" hose it will expand to the same size as the fire brigade use.

Something like that 

https://www.youtube.com/watch?v=APfGwAeflp0

[dazmond]

I've used 10L and 12L heaters - - I found that when it was really frosty & I only wanted lukewarm water (I didn't want to break any panes from thermal shock) that the minimum setting on both was still too hot.

I found 8L to be the sweet spot for me,.. but if you've got a really high flow rate then you might get away with a bigger unit.

i find the L10 just right for me even in cold weather like today.on min  setting its warm but not hot. i do use a high flow though(70 on controller)on a standard shurflo pump