domestic hot water tank advice needed!

[Erie Fred]

A couple of diodes, electrodes in the water tank, and viola !
make hydrogen, store that and burn it when needed, no insulation losses.

 

[gaz1]

Limescale shouldn't be relevant here. Gaz's videos are showing DHW water heaters, so there's a constant drain off and topping up with drinking water. Your thermal store should be the same old water in it all the time. With whatever inhibitors and softeners required. Getting heat from the store into DHW though, will inevitably involve a heat exchanger which, because it's got tap water flowing through, will be prone to corrosion or scale.

the above would be correct if you are running it as a heat store only then you would be treating it, if using normal water

if you are running it as a dhw / domestic hot water system then the videos are correct

if your using oil then you can gain higher temperatures ( solar ) or heat store oil can be heated up to 300f

id run the dhw as a replaceable unit that is fed from the heat store this can be x2 for large houses due to there run of pipe needed ( but many dont like this cost, then moan its not instant hot water )

both the wood/pellet stoves boilers would need replacing at intervals due to wear and tear, but they do affect the cylinders coils as they do wear out. if they are treated they should last longer

wood stove is the fail point even if treated its the heating and cold cycle of the material that fails within the wood stove

pellet burner should be fine as treated

 

[finyuk2005]

McDonald? I've one of theirs. Am hoping it will be reliable. Might be worth getting a quote for two off the shelf 500l ones. Probably more expensive but you never know.

If you want to divert more than 3kw per phase, you can. Some brands of diverter will, intelligently, run two diverters in tandem, that will run two immersions simultaneously. And I've also seen a specialist 6kw diverter made by "MK2 PV router", which you could tie together with a 6kw immersion. 6kW per phase.... that's a LOT, for a domestic property. Any chance of reducing the heat load?

Limescale shouldn't be relevant here. Gaz's videos are showing DHW water heaters, so there's a constant drain off and topping up with drinking water. Your thermal store should be the same old water in it all the time. With whatever inhibitors and softeners required. Getting heat from the store into DHW though, will inevitably involve a heat exchanger which, because it's got tap water flowing through, will be prone to corrosion or scale.

Yeah its Mcdonald in Fife indeed, we would probably look at getting one the same shape made so its less re-plumbing to fit, i will see if it is repairable first though!

As for diverting exess power, i was planning to just use one of the several relay outputs from the Victron inverter system to trigger contactors to power immersions

 

[finyuk2005]

the above would be correct if you are running it as a heat store only then you would be treating it, if using normal water

if you are running it as a dhw / domestic hot water system then the videos are correct

if your using oil then you can gain higher temperatures ( solar ) or heat store oil can be heated up to 300f

id run the dhw as a replaceable unit that is fed from the heat store this can be x2 for large houses due to there run of pipe needed ( but many dont like this cost, then moan its not instant hot water )

both the wood/pellet stoves boilers would need replacing at intervals due to wear and tear, but they do affect the cylinders coils as they do wear out. if they are treated they should last longer

wood stove is the fail point even if treated its the heating and cold cycle of the material that fails within the wood stove

pellet burner should be fine as treated

Im still trying to get to grips with the whole system, but I did have to replace the one circulation pump that pumps hot water through 2 diverter valves, either the radiators or into the hot water tank in the house.
The (60kw i think?) Windhager pellet boiler, 3 ton pellet hopper and the 1000L tank is in the shed next to the house

 

[gaz1]

@brewdexta

has alreaady done one roughly same as yours

Pellet stove for the workshop?

It's coming up to the time I have to winterise the workshop by smearing the lathe and mills with thick oil to stop condensation. No point using a dehumidifier as I would be dehumidifying Yorkshire, the workshop is too big and its not completely air tight. The workshop has heaps of insulation...

www.mig-welding.co.uk

and i believe hes adding solar and electric to the system or charging batterys

 

[Gareth J]

the above would be correct if you are running it as a heat store only then you would be treating it, if using normal water

if you are running it as a dhw / domestic hot water system then the videos are correct

if your using oil then you can gain higher temperatures ( solar ) or heat store oil can be heated up to 300f

id run the dhw as a replaceable unit that is fed from the heat store this can be x2 for large houses due to there run of pipe needed ( but many dont like this cost, then moan its not instant hot water )

both the wood/pellet stoves boilers would need replacing at intervals due to wear and tear, but they do affect the cylinders coils as they do wear out. if they are treated they should last longer

wood stove is the fail point even if treated its the heating and cold cycle of the material that fails within the wood stove

pellet burner should be fine as treated

Unless this is a hotel or something, I strongly doubt they are storing 1000l of DHW. Especially considering we know there is a pellet boiler involved. And we know there is, currently, a separate DHW tank. But, hey ho, some people do mad stuff with heating and hot water. Maybe you're right!

 

[Gareth J]

Yeah its Mcdonald in Fife indeed, we would probably look at getting one the same shape made so its less re-plumbing to fit, i will see if it is repairable first though!

As for diverting exess power, i was planning to just use one of the several relay outputs from the Victron inverter system to trigger contactors to power immersions

The victron relays will either be on or off, so won't throttle intelligently, like a diverter. So you will inevitably end up overshooting and either importanting, or exporting energy. But yea, you've already got the victron relays.

 

[gaz1]

Unless this is a hotel or something, I strongly doubt they are storing 1000l of DHW. Especially considering we know there is a pellet boiler involved. And we know there is, currently, a separate DHW tank. But, hey ho, some people do mad stuff with heating and hot water. Maybe you're right!

I would as ive been there already

theres nothing worse than having to wait 1-2hrs as shes pinched all of the hot water for her bath

as thats how long it takes to reheat a standared 300L hot water cylinder weather you are using a wood stove or central heating or electric

its fine if you use showers though

 

[Gareth J]

I would as ive been there already

theres nothing worse than having to wait 1-2hrs as shes pinched all of the hot water for her bath

as thats how long it takes to reheat a standared 300L hot water cylinder weather you are using a wood stove or central heating or electric

its fine if you use showers though

Eh? Who's asking what systems you'd like to have? I'm merely pointing out that the OPs thermal store is unlikely to have fresh water in it and therefore your limescale stuff is unlikely to be relevant. Like I say, I might be wrong but, given the information we've been given, doubt it. Either way, probably best @finyuk2005 finds out for himself, keeps it to himself and we move on.

 

[gaz1]

ive been digging at these water tanks

these are american gas water tanks enamal glazed

vs a 40 year old one