Usually, this is done via an immersion heater, scheduled to operate once per week.
With most Vokera boilers there is a Legionella program
Usually, this is done via an immersion heater, scheduled to operate once per week.
With most Vokera boilers there is a Legionella program
Yes, on boilers but not usually possible with heat pumps. There are some that now can, but why would you need them to, apart from the weekly Legionella program... If you're all electric then best let an immersion do that.
Then again... If everything's eventually going to be leccie, might as well have a direct cylinder for all DHW.
If you're having radiators and underfloor you'll need a system that can offer two flow temps for heating with an electronic mixer or a mechanical thermostatic blending valve for the underfloor.
Yes, DHW reheat can be done priority as the coils within are large area and give rapid reheat at high temp so short lived lack of heat to space heating is not noticed. Just like a combi.
Not sure just what a thermal store can offer that a boiler, cylinder etc cannot unless you plan to incorporate a heat pump as well.
There are Vokera boiler, heat pumps and controls that can do all this.
I had a chat with a heat engineer today about the various options. I will check with others for their opinions too. There just seems to be so many options to consider, I'm only used to combi's since removing an open vented tank a decade ago, not modern unvented systems. Whats the benefit of having a tank over a combi if your having PDHW? Is it just so you can run two showers at the same time?
I will now select a boiler with Opentherm, but not too sure about PDHW, need to know more about it & how long it takes for a tank to heat back up after having a bath or 10 minute shower?
- Does it heat the stored water rapidly by supplying a flow matching the stored temp, or does it increase the temperature much higher for the rapid heat, ie: 60C stored has a 75C flow when in PDHW mode?
- Can you disable PDHW if you don't like the downtime for reheats?
- Radiator flow temps were going to be designed for 55C radiators and UFH around 45C using blending valve on UFH manifold.
- Thermal store idea was just for ease of installation and not having to pay out a separate £100 annually for UVC services on top of the annual boiler service usually similar price. For either thermal store or UVC i'd like the option to add solar PV with battery storage or ASHP at a later date if things head in this direction. Budget doesn't allow for these at the moment when installing a gas boiler.
I seen a video of a guy explaining that if your going to buy a central heating water tank, Always opt for 2 coils inside over one like a solar tank. Even if your not going to use it for solar, just get your 28 or 22mm flow from the boiler and send it to both coils so that your getting more heat put into the tank for a quicker reheat time. He just said this wouldn't work properly. Mentioned about flow and some kind of disruption to the flow or the tanks heating balance with the coils being in different positions operating at the same time where as they'd usually be running at different times for solar and gas. I can ask again when i speak next.Not sure what your heating engineer is getting at.
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