Thermal store question

endecotp said:
I know next to nothing about these boilers so my advice is to do what the manufacturers (or installers, or other experts) advise.

But since you've asked - yes modulating down obviously helps. But does it start at a high output and then modulate down after a few minutes, as some gas boilers do? If it does then you may find that it doesn't have the opportunity to modulate down before its internal thermostat turns it off. And it's also quite possible that your heat demand will sometimes be below 5 kW, if you have TRVs and most rooms are up to temperature.
Click to expand...

Yes the latter is true - there are TRVs on all the rads and so as the temperature approaches the set temperature then the heat demand could drop below 5 kW. It definitely modulates down over a prolonged period but I couldn't say how long. It takes about 5 minutes to get up to full power if the boiler is still hot from the last burn (i.e. typically around 55C) but can then tick-over at 5 kW for quite a while, again I have never recorded how long. Sorry that sounds pretty vague.
 
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GoferBlue1947 said:
OK chaps, I get the message. Thanks for your thoughts.
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It's not that, but on my installs, I take a great deal of time and effort in the design and setting up of my Biomass systems, and there is nothing worse than being called out to a system where the end user has taken advice from the internet and decided that he knows more about the system than I do, they then access the system parameters, mess them all up and then call me insisting that I fix it for free because they have done nothing and it is my design... Had one, who had backed off the pellet feed to give him a maximum output of 2kW and wondered why his house was cold.... But he saved a hill of cash on his pellets
 
OK gentlemen, another idea!

As the thermal store is no longer used as a thermal store per se (i.e. not used for DHW as we have a separate unvented DHW/solar tank now and the TS solar coil is redundant) what about keeping the boiler side as a vented system and heating the store direct as now, but using an external plate heat exchanger for the C/H system? That way the C/H system is completely separated from the boiler and could be pressurised/flushed/maintained independently. The thermal store becomes a simple buffer tank without the worries of maintaining stratification?

Any thoughts appreciated.
 
GoferBlue1947 said:
OK gentlemen, another idea!

As the thermal store is no longer used as a thermal store per se (i.e. not used for DHW as we have a separate unvented DHW/solar tank now and the TS solar coil is redundant) what about keeping the boiler side as a vented system and heating the store direct as now, but using an external plate heat exchanger for the C/H system? That way the C/H system is completely separated from the boiler and could be pressurised/flushed/maintained independently. The thermal store becomes a simple buffer tank without the worries of maintaining stratification?

Any thoughts appreciated.
Click to expand...


No body else has mentioned it, but I would be very surprised if the boiler can really be used on a sealed system.

Most solid fuel systems need an open vented system as they cannot be turned off immediately like gas.
 
Agile said:
No body else has mentioned it, but I would be very surprised if the boiler can really be used on a sealed system.

Most solid fuel systems need an open vented system as they cannot be turned off immediately like gas.
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Other way round Tony, seal the heating and hot water circuits, leave the boiler and buffer open vented.. I do it when the customer asks me to fit some obscure Eastern European pellet boiler with no means of dousing the flames or quench coil fitted..
 
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