We recently bought a Lohberger LC80 combi oven / backboiler from a friend. It had little use and they liked it however they took a different route due their age and other reasons.

We are looking to use the combie for space heating, winter cooking, hot water and radiator feed. Apparently it can do all these things and our super insulated straw bale house has relatively low energy requirements.

Has any here used this particular model for the purposes we are intending? The heating engineer we are working with is unsure it has enough oomph to do service rads as well. I contacted Lohberger and they said that it would work however the correspondence with the German based team is limited due to language.

Cheers,

<blockquote><cite>Posted By: Peter_in_Hungary</cite>I don't know the LC80 of which you speak, however whether it will manage the rads is just a calculation of the back boiler output and the radiator load. But with wood burners you have the added complication of the fuel quality - poor fuel won't heat the rads properly - or in the case of the oven - bake the bread at a high enough temperature. With combis there is always the compromise when you have competing demands of heating and cooking and you will have to decide on the priority at the time. With one fire box look at the options for directing the energy to where you might need it simultaneously and see how it fits your needs i.e can you cook the Sunday roast and Yorkshire puds and recover the DHW at the same time - if it is an issue for you.</blockquote>

Hi Peter, I should have mentioned that we have 5.5 kw of solar panels and will have up to 3kw immersions fitted into the thermal store so that any excess energy is dumped into heating water. Not any use on low sun winter days however when it is light should help take the pressure off Lohberger. We are off grid btw.. though do have woodland here and a sustainable woodfuel supply.

Posted By: djhHow much power does it put out to the water and how much to the room?

What is the total heat demand of your house?

5kw water and 4.9 max to room though this can be baffled down to 2.2. Heat demand from SAPs assessment is 3.4kw.

My SAP calculation doesn't give a maximum power figure, just energy per year, but the /m² number is 63% bigger than the PHPP figure and is based on SAP's floor area which is itself 12% bigger than PHPP's. So the SAP estimate is 83% bigger. The PHPP one is a lot closer to my actual bills.

So I think you may have a problem with the stove overheating the room it is in, and perhaps the whole house generally. You'd end up with the classic case of opening the windows with the heating on. It depends how long you run it for, of course.